Informing Articles

On this page we will display published articles out of various hunting magazines, which dealt with some of the products we are distributing.
Not all articles are read by every hunter and by displaying these articles here on our website, hunters who missed certain issues of magazines, or do not have access to foreign magazines, now get the opportunity to become fully informed about some of our products, as seen and experienced by users all over the world.



Preparing Cases for Long-Range Accuracy -

A very interesting article to read for all reloaders - both hunters and long range shooters can benefit tremendously from the expertise of somebody who specializes in long-range, precision rifle, technical reloading, and optics.

Read more.


Rod & Rifle: An absolute game changer

The New Zealand magazine Rod & Rifle has reviewed the SuperChrono acoustic shooting chronograph. Under the header An Absolute Game Changer the article goes into details about the chronograph and concludes with a comparison test:

I tested the SuperChrono in conjunction with the well respected Oehler 35 Proof chronograph. The Oehler has been the industry standard for commercial chronographs for the best part of two decades and is used by ammunition manufacturers as well as military institutions.

The results were impressive in their consistency, the SuperChrono higher by maximum of .03 of a percent. The Oehler average during this string of shots was 2735.9 FPS and the SuperChrono showed 2736.6 FPS. A less than 1 FPS averaged over 18 shots.

The SuperChrono impressed me; it is a much easier unit to use than its competition, set up at the range is two-minute job, it is unaffected by the environment and it’s accurate.

I do note that it never once missed recording a shot.

The reviewer concludes on the following note:

My verdict is, as you would guess, overwhelmingly positive. This is a well designed and engineered product. It is the best chronograph I have used and I will be buying one.

Follow this link to read the article - Rod & Rifle SuperChrono Review


GunMart review of the Steinert NeoPod Bipod -

By: Graham Allen

Country Sports Wholesale recently invited me to a press day and one of the products being demonstrated was a very clever little bipod. Now, there are loads of bipods on the market, usually made from steel or alloy tubing and are fairly conventional affairs; the Steinert NeoPod however is very different! Most of the pods I have weigh around a pound and I've always thought that was about as light as you could make one but the example I was shown weighs in at around the same as two 12 bore cartridges!

FEATHERWEIGHT!
The actual bipod section weighs 2 7/8 oz, or 81-grams and the mounting hardware is 1¼ oz, or 36-grams. All up it's only 4¼ oz or 117-grams. Compare this to a Harris at 14oz/ 398-grams and it's a real flyweight. The only thing that comes near it is the magnetically attached Javelin Ultralight at 125-grams, but that is not a universal QD stud fit.
To be fair, when I first saw it, I thought it looked a bit flimsy and might have been OK on a lightweight pre-charged air rifle. But a rimfire or fullbore would make it buckle under the weight just trying to support the rifle, let alone be used in the field - how wrong I was! You see, the NeoPod is made from a rather clever thermoplastic polymer called Polyether Ether Ketone (PEEK), reinforced with carbon fibre; though I think PEEK rolls off the tongue a tad better! PEEK is said to be twice as strong as stainless steel but half the weight of aluminium and is usually employed making replacement vertebrae, hip and knee joints, as well as all manner of automotive and aerospace components.

BASIC CONSTRUCTION
The legs of the unit are moulded and as I mentioned earlier, don't look very strong but try as I might I couldn't damage them. They are attached to a central yoke, which is fitted to the rifle via a lightweight, aircraftgrade alloy spigot. A collar is placed over the rifle's QD stud on the forend and a stainless pin inserted where the sling swivel would normally go, the spigot is then secured via a thumbwheel and a handy tool is included to make sure it's tensioned correctly. You can still use a sling if required, as a mounting point is built into the rear of the spigot.
The legs can be adjusted for length by pressing a small catch and the springloaded inners pop out at 55° to each other and can be adjusted in 7mm increments to compensate for uneven terrain. Vertical height adjustment is from 6.7" retracted to 9.4" fully extended; very much the spec of the benchmark Harris BRS (Bench Rest Swivel). Domed rubber feet ensure a secure footing in all manner of conditions.
The legs are held under the rifle by spring tension as well as small magnets; to deploy them they are pulled down, where they lock into position. To stow they must be pulled down first to release the locking detent. To remove the bipod from the spigot, a catch, similar to the ones that extend the legs, is pressed across and the unit can be stored in a cloth bag that is supplied. I doubt the NeoPod will be removed very often though, as it weighs next to nothing. Once this clever item is fitted to a rifle, it’s almost as though it's not there at all and it completely transformed the weight and handling of my Anschutz .22 Hornet calibre foxing rifle.

FIELD TEST
I've used the NeoPod on many occasions when visiting the farm over the last month or so and it's done everything it's meant to do, with solid support when shooting and virtually disappears when you're carrying the rifle due to its light weight and lack of bulk. There's 40° of cant available, so levelling in position is simple, plus the legs can be adjusted if necessary. The rifle remained rock steady when on aim and I really can't fault it. I'll be attaching this clever little item to my Southern Gun Company Speedmaster straightpull AR15 and using it throughout the next Civilian Service Rifle winter league. I'll be shooting in the Practical Optic' class, where bipods are allowed and I'm sure it will provide a perfect support when shooting prone but won't add too much weight when running from one shooting position to the next. Equally importantly it won't impede my standing and kneeling shots when folded out of the way and the lack of weight will be welcome.

HERE'S THE CATCH
OK, all this lightweight polymer technology and superb design doesn't come cheap and at a price of £299 may make a few people reading this recoil in horror! However, there will be others who think "I'll have one of those". They'll be the shooters who've,
A - got the money for whatever bit of shooting kit they want and
B - those who see the NeoPod bipod as being just the thing for their lightweight stalking rifle.
Shooters can quite easily spend a couple of grand on a rifle/scope combination, so when compared to that, it might not look so expensive. I look forward to using this clever bit of kit in competition and I'll report my findings later in the year.


An interesting article by the man behind the NeoPod -

Why an Ultralight Bi-pod?
The NeoPod started out as an answer to a personal frustration. I do a lot of mountain hunting. Every now and then I felt the need for a bi-pod but hadn't found one I'd like to carry along for that odd chance. The H***** is great but digs into your shoulder when mounted on the gun, the V******* has a great quick detach mechanism but it is too heavy. I must have accumulated every bi-pod on the market without finding one I liked to bring on my hunts. Instead of a bi-pod I have of course used my backpack. But sometimes you hunt without a backpack, as in Africa, and I have resorted to using the binoculars or taking off my boot to use as gun rest.

Three years ago I gave the engineers the following brief:


"Give me a bi-pod weighting less than 100 grams, which fold up without bulk, has a quick detach mechanism and use magnets instead of springs".

- Halvdan Nicolaysen, Owner.

It's the Go-Anywhere Bi-pod
It weighs next to nothing, 82 grams, and it's sleek. You can keep it on your gun, put it in your pocket or carry it in the belt pouch next to your ammo. It attaches in a split second and does everything a bi-pod should. It has built in tilt and adapts instantly to uneven terrain. It's got just the right amount of built-in play to follow moving targets. The surface is super slick and the mechanism and buttons can be cleared of debris by just tapping the bi-pod at a hard object.
In fact, we've tested it packed with wet and dry snow, ice on the inside, mud and sand, hot and freezing cold. Nothing sticks to the surface and the buttons can be cleared easily in all cases. The slick surface also ensures a very smooth extension of the legs. This compared to aluminium on aluminium which has a very high coefficient of friction.
The material flexes and absorbs some of the recoil, making a fast follow-up shot possible.
Lean lightly into the gun and the bi-pod firms up just as it should.
Compare this to any other folding bi-pod. They are 300-400 grams heavier and bulky and there's no way you would carry them just in case. Some lightweight bipods require custom interfaces requiring a visit to the gunsmith. The NeoPod uses standard Recknagel and Uncle Mike sling swivels, push-button horizontal or vertical or Picatinny. Why reinvent the wheel?

PEEK, the highest performing material in the world
The NeoPod is made from 30% carbon fibre reinforced PEEK polymer. PEEK is generally considered to be the highest performing material in the world. It's found as a weight-saving replacement for aluminium and steel in many demanding environment throughout the aeronautical and space industries.
It has 50% lower density than aircraft grade aluminium and 87% lower than stainless steel for comparable strength/mass. It's actually harder than aluminium and more flexible and kink resistant. Memory, wear and friction is superior to aluminium and steel. The downside of the material is its price. Cost per kg is $131 compared to around $7 for aircraft grade aluminium. It's just like a supercar; the reduced weight and added performance come at a cost.

We're Proud of the NeoPod
It does all a bi-pod is supposed to do but at a much, much lower weight. Place three rounds of .308 Win in your hand and you'll get an exact feel for the weight. The NeoPod detaches and attaches in a split second. It hugs the barrel or forearm when folded and when mounted on your gun the rig slips easily into your Eberlestock pack.
The legs deploy with one downwards flick of the fingers. The sound signature can easily be controlled by the patent pending buttons for leg extension and retraction.
The folding mechanism is ingenious and we have a patent pending for that as well.
The adapters are all standard so you don't have to waste time at the gunsmith's.
It tilts and adapts quickly to uneven terrain. It has built-in play to follow a moving target. It firms up when you load it. The legs flex allowing for a quicker follow-up shot.
It even looks a million dollars.
We're proud of the NeoPod and think it's the product we always wanted ourselves.
We're sure you'll love it, too.


Although the following article was already published during July, 2013 in the USA, shortly after GS Custom started producing their bullets in the USA out of their second factory, it is still as much applicable as then, if not even more so at present.
Hence our decision to place the article here as well.

WHEN THE BULLET IS ACTUALLY DIFFERENT?
by Mike Price.


GS HV - South Africa to the USA

The morning sun just broke over the horizon and between the trees lighting up the forest floor. I heard a limb break and slowly turned my head in the direction of the noise. After a few minutes a 225 pound boar stepped out into the open at my 150yd mark. I lifted my 30-06 drove home a 150gr GS HV and the boar was immediately down. Two weeks earlier I dropped a nice buck at just over 230 yards and he was immediately dispatched and on the ground. I was impressed with this 150 grain bullet, but even more impressed with the wound channel it left. It was a beautiful straight line with and exit on a quartering shot I took when shooting the boar.

The GS HV is actually a different bullet in its design and performed better than the other monolithic bullets I had used to date. I have become fascinated with the GS HV over the years. Since it is now produced in the USA, I am able to easily obtain them and do not have to wait long to receive them or pay shipping from South Africa.

The GS HV is designed different than standard or monolithic bullets we are familiar with. The rules can only change if a given bullet is different enough in the way it interacts with the lands and grooves when traveling down a rifled barrel. This would mean the difference is enough to give results outside the standard norms that we are use to experiencing with cup-core, bonded or grooved monolithic bullets. I have been a reloader, shooter, and hunter for over 30 years. I have come through many experiences with a fair understanding of what good results are in the field as well as accuracy at the range, especially with the GS HV.

Over a 4 year period I used only monolithic bullets on my hunts (Barnes TSX, TTSX and GS Custom HV) when using different cartridges and rifles I own. It was a very interesting time and also for the most part disappointing as far as terminal results with the TSX and TTSX were concerned. I know there are those who swear by the TSX and TTSX, but I found myself wanting to swear at the Barnes monolithic bullets. I was not impressed with wound channels on my longer shots. Yes, the Barnes bullet killed every animal I shot with them (they should have), the shots were placed exactly where they were supposed to go. Only problem was I ended up having to hunt for a period of time for all but two of the animals I shot with the Barnes bullets. There was a consistent and bright side during those 4 years of trying monolithic bullets. When I used the 150gr GS Custom HV in my 30-06, not only were there great wound channels, but I did not end up chasing my game.

There are some good reasons for better results with the GS HV and I will explain why in just a moment, but first lets talk about a few things important to a bullet's ballistic performance internally, externally and terminally. All hunting bullets have what we call an ogive. The ogive is the curved portion that ends in the bullet tip and a shank or the cylindrical section behind the ogive. This section behind the ogive defines the bearing surface, the portion of the bullet that touches the lands and grooves when the bullet is riding down the barrel. The diameter of the shank must match the largest inside diameter of the barrel, called the groove diameter - for .30 caliber it is .308". A rifled barrel also has lands and the lands diameter is smaller than the groove diameter.
When a bullet moves through the barrel, the lands carve out a groove in the bullet which runs the entire length of the bearing surface of the bullet. The lands grab the bullet and cause the bullet to rotate and spin which is necessary for good accuracy. The lands carving out a groove in the bullet and the obturation of the bullet as it fills the bore, presses against the wall of the grooves and increases the friction between bullet and barrel. Bullets with long shanks will create higher pressure due to more friction area than bullets of similar weight with shorter bearing surfaces, if all else is equal.

Higher pressure can and generally means higher velocities. The problem comes when increasing the powder charge you will eventually reach a point where the pressure rises very rapidly with very little or no gain in velocity. A bullet with a shorter bearing surface of the same weight will reduce friction in the barrel by reducing the amount of surface contacting the barrel. This would allow a reloader to increase his charge, hence also the velocity.

The trick is to reduce the bearing surface enough to really make a big difference in pressure and velocity, while still having an accurate bullet. That is exactly how GS Custom HV bullets work, they have reduced the bearing surface and are very accurate. They have small thin concentrical driving bands (not grooves cut in the bearing surface like Barnes or Hornady) on the shank and only these driving bands will touch the groove diameter of the barrel. This means that the lands engage far less copper (as they cut through these thin driving bands) than with conventional bullets or grooved monolithic bullets. The GS HV bullet will build up pressure much slower and in general, achieve higher velocities than conventional or grooved monolithic bullets of similar weight in any given caliber.

Example: In my 30-06 with a 22" barrel with 150gr standard cup core bullets, I can get 2900-2925fps. With Barnes TSX and TTSX I can get 2935-2978fps with a 150gr in my specific 30-06. Yet, with the GS Custom 150gr HV I am getting on the average 3086fps. This greater velocity is a huge advantage when you consider down range ballistics and time of flight.
Also, the HV is designed to act totally different terminally than either the cup core or grooved monolithic bullets mentioned above.

GS Custom HV bullets are designed to give the lowest possible total air drag in flight, that is possible for a given caliber. Coupled to the fact that they are turned from pure copper, these bullets are on average 20% longer than jacketed lead bullets of similar weight. The result is a range of bullets with ballistic coefficients comparable to the heavier bullets, but with the speed advantage of lighter bullets. When the HV is moving 2800fps or faster it will lose its petals during penetration and this is by design. It has been proven that a high velocity flat fronted cylinder shape will leave a larger primary wound channel than a slower, double caliber mushroom. GS Custom HV bullets are therefore designed to start mushrooming reliably from much lower speeds than most other premium bullets, typically from around 1000fps. Three quarters to one and a half inches of penetration is all that is required to fully expand an HV bullet. With high velocity the flat nose (meplat) creates a consistent cavitation wound channel, which allows for deep penetration in a straight line and will drop game immediately in their tracks.

What is so cool is the 150gr HV in my 22" 30-06 barrel traveling 3086fps will drop deer size game in their tracks even on long shots. It is capable of dropping dangerous game effectively on up close shots and out to 115 yards and still has over 2,000 pounds of energy at 260 yards. This is unheard of for a 30-06 with a 22" barrel shooting a 150gr bullet. An added plus is the bullets ability to actually begin to open up as low as 1,000fps, far better than any other monolithic bullet, allowing for effective shots at longer distances. As I have already mentioned earlier, that at higher speeds, HV bullets will lose the petals entirely, shedding 12% to 15% of weight and presenting a flat cylinder shape to the direction of movement (not like some other monolithic bullets that can and do lose one or two petals at high velocities causing the bullets axis to change and begins to tumble not traveling in a straight line). I have actually had a Barnes TSX that changed direction after four inches of penetration and ended up exiting in front of the opposite shoulder, missing the heart and lungs due to the change of direction and needless to say I looked for 2 hours before finding that animal. The GS HV concept offers at worst, a good double caliber mushroom, with extremely high retention and, at best, a high speed cylinder shape for dramatic primary wound trauma - the best of both worlds in one design.

GS HV bullets are turned on high-quality, Austrian-made CNC machines from 99.9% pure copper bars and tolerances are held to less than 0.005mm. GS makes sure the room temperature is controlled to ensure that heat expansion of the equipment or copper bars does not affect the final sizing of the bullets. The GS HV Custom bullet is measured four times on a Swiss digital micrometer (accurate to 0.001mm) to ensure that dimensions are kept within specs.

Load development is simplified with the driving bands and the bullets are not speed sensitive for grouping. Copper fouling is reduced to levels not previously possible. Barrel and throat life is more than doubled and barrels run cooler. Due to the monolithic construction, terminal performance is enhanced and bullet failure due to complete fracture is eliminated. Less wind drift due to good BC and much higher velocities than standard bullets can give. Trajectories are flatter, making range estimation less critical. Time of flight is reduced. Even if an animal moves unexpectedly as the shot breaks, the point of impact will be closer to the mark. Momentum and energy levels are elevated, enhancing terminal performance over a wider range of distances and speeds. Meat damage is confined to the bullet path and bone fragment damage is also reduced, putting more meat in the freezer.

I will have to say I am highly impressed with the GS Custom HV bullet allowing all my rifles in different cartridges to perform above their standard performance levels and the terminal results are not matched by other offerings. They cost more than other bullets and they should, they give you more. Your bullets are the cheapest thing you take on a hunt, don't sell the hunt short. When the bullet is actually different, it gives different results and in this case, the results are very impressive with the GS HV. I can't wait to try the 116gr HV with a BC of .468 in my M48 TGR 7mm08 this year. The GS HV bullets are unique, they are different, not a copy or dressed up version of an already existing bullet. They are a new idea and a good one at that. I like them!

Mike Price is a lifelong shooter, hunter and reloading enthusiast. He has been published at AmmoGuide.com, Guns & Ammo and Nosler. Mike has traveled to Africa, Europe, Asia, parts of Central America. His favorite two hobbies are spending time with grand children and taking them hunting. Mike holds a Ph.D in Philosophy and Psychology, is a licensed clinical therapist, adjunct professor and Minister in the Church of Christ.


ZIMBI Newsletter 3 - End September 2015 -

Koeëlvervorming - (The all too familiar mushroom effect)

Deur Koos Geldenhuys.

Jagters praat gereeld oor hierdie bekende koeëlvorm, wat bekendheid verwerf het uit die dae toe ons nog almal met lood koeëls of loodkern/kopermantel koeëls gejag het.
Met die hedendaagse moderne en verskillende tipes monolitiese koeëls, wat almal verskillend vervorm op impak, weens hul verskillende ontwerpe en ook die hardheid van die verskillende metale wat gebruik word, is dit die meer as kaliber vervormde grootte van die koeël, wat steeds 'n warm besprekingspunt is om kampvure.

Nieteenstaande al hierdie verskillende tipes koeëls, bly dit steeds nog dieselfde fisiese kragte van toeka se dae, wat meebring dat koeëls vervorm soos wat jagters vandag nog waarneem.

Wat is hierdie kragte wat die paddastoel / "mushroom" vorming van ons koeëls tot stand bring?

Voordat ons hierdie kragte wat inwerk op ons koeëls se vervormingsproses naspeur, moet ons net eers een ander belangrike aspek uitlig en veral verstaan dat dit 'n voorvereiste is vir enige koeël in vlug, om op impak die bekende paddastoel vorm te kan aanneem.

Dit is naamlik om 'n geskikte giroskopiese stabiliteitsfaktor [Gyroscopic Stability (Sg)], wat vereis word vir verskillende jag afstande, verkry moét word deur die korrekte koeël lengte te kies wat pas by die spesifieke geweer loop se spiraal (twist) en sodoende sal verseker dat die koeël stabiel sal wees in vlug, tydens impak en selfs gedurende penetrasie daarna. In baie kort net, stabiel in vlug vir 'n koeël, beteken dat die koeël se rigting van vlug 100% saamval met die lengte as van die koeël.

Met hierdie vereiste behoorlik in plek, kan jagters verseker wees dat 'n goeie gehalte koeël op impak 'n baie mooi paddastoel vorm tot gevolg sal hê.

Anders as wat hedendaags beweer word dat die krag agter die vervormingsproses van ons koeëls is, naamlik die werking van sogenaamde kinetiese energie, het 'n Amerikaanse fisikus reeds in die jaar 2006 met behulp van Newton (1) se wette, 'n beskrywing gegee en ook 'n stel sketse gemaak om te bewys wat hierdie vervorming werklik veroorsaak en tot gevolg het.
Eers in die jaar 2009 is ultra hoë spoed kameras sodanig ontwikkel, sodat dit die impak momente van 'n koeël ten volle kon verfilm.

Hierdie twee gebeure word hierna weergee.

1. Die fisikus se weergawe in 2006 reeds saamgestel -

"Here at the centre of the nose, the acceleration rates are extremely high. Not so for the remainder of the bullet's body where the rates are progressively lower the farther back one goes. Thus with different portions of the lead bullet experiencing different rates of acceleration, the bullet is forced to change shape. The lead behind the nose not only experiences high linear acceleration as it is slowed to a relative stop, it also experiences a brief centripetal acceleration as it is turned aside from a straight-line motion by the already stopped central nose lead resulting in the familiar mushroom shape. Even the lead behind the mushroomed head will show signs of acceleration forging as the bullet's caliber size is noticeably swollen or increased in diameter."

2. Die ultra hoë spoed kamera bevestiging van die vorming van die paddastoel in 2009 -

Een van die talle raampies (frames), kort voordat die koeël heeltemal versplinter, toon die duidelike ooreenkoms tussen die foto vorm van die koeël en die Amerikaanse fisikus se finale sketsvorm van die vervormde koeël - sien foto hierna -

Dan ook die volgende video oor die vervorming van die koeël met die ultra hoë spoed kamera -

Dit dan die werklike redes en kragte wat jagters se koeëls vervorm in die alombekende paddastoel / "mushroom" vorm.

Referrence: (1) Newton's LAW III: To every action there is always opposed an equal reaction: or, the mutual actions of two bodies upon each other are always equal, and directed to contrary parts.


WILDLAND - September 2015 -

Steinert SuperChrono
Deur Pierre van der Walt

Ek het al 'n hele paar kronograwe in my tyd besit. Die eerste was een van die klein Oehlers en later 'n Oehler M-35P, wat ek nog gebruik. Ek het ookal die pad gestap met verskeie Shooting Schronys, 'n Pact, 'n CED Millennium en onlangs ook 'n Caldwell.

Elkeen van die kronograwe beskik oor eienskappe waarvan ek hou en minder van hou. Die Oehler M-35P is ongelooflik akkuraat, maar massief en neem 'n hele ruk om op te slaan. Dit bied die voordeel dat dit ook sagteware bied waarmee mens met behulp van spanningstrokies (strain gauges) relatiewe druk kan bepaal. Dis 'n duur stelsel en ek moet bely dat ek die Pressure Trace-drukbepalingstelsel bo die van Oehler verkies.

Die Shooting Chronys is lekker kompak, vinnig om op te slaan en as jy die korrekte model gekies het, bied dit voldoende inligting om ladings mee te bereken en trajekte te bepaal. Alle Shooting Chronies is egter nie ewe goed nie. Op sommige modelle verloor mens die data as jy die masjien afskakel en ander se geheue is maar beperk.

Al hierdie kronograwe het egter twee dinge in gemeen. Eerstens bied hulle 'n relatief klein area wat begrens word deur draadjies en ligskerms waardeur mens moet skiet. Gemeet aan die aantal kronograwe wat weekliks vervang word omdat die manne wat hardlopende springbokke in die oog skiet op 'n kilometer, ook daarin geslaag het om hul kronograwe raak te skiet, is die stelsel 'n ernstige probleem vir ons jagbrigade. Die tweede probleem is dat die kronograwe ogies of sensors gebruik om die skaduwee van die koeël wat oor hulle flits waar te neem om 'n lesing te gee. Ligkwaliteit, ligrigting en sulke veranderlikes veroorsaak nogal heelwat probleme vir ons.

Daar is twee nuwe neigings in die kronograafbedryf. Die een is om supersoniese akoestiek in plaas van ligsensors te gebruik, en die ander is radar. Die akoestiese kronograaf gebruik die supersoniese "skokgolf" van die koeël, om 'n lesing te neem.
Die Steinert SuperChrono akoestiese kronograaf is onlangs in Suid-Afrika bekend gestel en ek het die geleentheid gekry om dit te toets. Die SuperChrono is 'n duursame, ligte en kompakte kronograaf wat vier AA-batterye gebruik. Dis vog- en stofbestand, stewig gemaak, is uiters kompak en weeg slegs 285 gram. Die 260mm lang kronograaf word ook nie belas met skermdrade en ligskerms nie.
As pakket is dit gerieflikste kronograaf wat ek nog ooit hanteer het.

Dis ook eenvoudig om die SuperChrono op te slaan. Jy skroef dit doodeenvoudig op 'n kameradriepoot, plaas die SuperChrono ongeveer 3 meter voor die tromp van die geweer en verstel die driepoot onderkant die koeëlbaan tot Steinert se aanbevole hoogte vir 'n bepaalde kaliberklas. Die SuperChrono is met 'n korrel en visier toegerus waarmee mens dit met die teiken kan oplyn. Dit beteken dat mens die kronograaf noodwendig parallel met die koeël se vlugbaan opstel. Mens kan die SuperChrono uiteraard op enige afstand vanaf die die loop plaas, solank daar goeie rede is om om dit te doen en mens die lesings en die afstand met mekaar versoen.

Aangesien die SuperChrono nie skerms gebruik nie en aangesien die lesingsarea 1 300mm hoog is en 850mm wyd is, is die kans om die SuperChrono raak te skiet, uiters skraal. Dit is 'n massiewe "leesarea" wat ongeveer 300 maal groter is as gewone optiese kronograwe se leesarea, maar kom teen 'n prys. In my geval het die lesings verander as ek die koeëls deur die uiterste bopunt van die leesarea geskiet het, maar dit is onnodig om so hoog oor die SuperChrono te skiet.
Die SuperChrono neem wel lesings van supersoniese .17-kaliber-koeëls en kan koeëlsnelhede van tot 5 600 vps hanteer. Dit dek die hele spektrum van huidige jagkaliberballistiek.

Die SuperChrono gebruik die supersoniese akoestiek van die koeël om die lesings te neem en kan dus nie, soos die meeste ander kronograwe gebruik word om die spoed van subsoniese projektiele soos pyle, verfballe, sekere handwapens en die meeste windbukskoeëls te meet nie. Vir die meeste van ons is dit nie 'n probleem nie. Ek het wel lesingsprobleme ervaar toe ek met gewere met blitsbrekers oor die SuperChrono geskiet het.

Die SuperChrono bied al die inligting wat mens van kronograwe verwag. Die inligting van 99 skote kan gestoor word en met behulp van sewe knoppies bo-op die kronograaf bestuur word.
Dis heelwat minder as sommige ander kronograwe, maar ek moet erken dat ek nog nooit in my hele lewe die data van 99 skote van 'n enkele skietsessie nodig gehad het nie.

Die heel lekkerste eienskap van die SuperChrono is dat dit nie ligsensitief is nie. Dit kan letterlik in die donker lesings neem. Die feit dat ligtoestande die SuperChrono nie affekteer nie, is 'n geweldige bonus. Volgens Steinert bied dit akkuraatheid van ongeveer 99.5%. Dis indrukwekkend en die SuperChrono het my meer betroubare lesings gegee as die ander twee kronograwe waarteen ek dit in verskillende ligtoetstande getoets het.

Behalwe vir die enkele punt van kritiek ten opsigte van die vertoonvenster, is ek werklik beïndruk met die formaat en akkuraatheid van die SuperChrono. Ek is oortuig dat hierdie konsep, met 'n paar praktiese veranderings, die toekoms van kronograwe gaan verander en ek sal voor in die ry staan daarvoor.



WILDLAND - Mei 2015 -

Gaan alles oor koeëlontwerp?

Kan bloot die ontwerp van 'n koeël die standaard aanvaarde interne ballistiese perke van 'n spesifieke geweer beter benut, asook die eksterne ballistiese eienskappe van so 'n koeël meer voordelig vir die jagter aanwend?

Dit klink dalk vergesog om net met die een aspek, naamlik die ontwerp van die koeël, hierdie omvattende taak te wil uitvoer.
Maar kom ons kyk hoe haalbaar dit is in die praktiese wêreld waarin die jagter homself bevind, hetsy dit gaan oor die jag van vlakte wild of gevaarlike wild en ook skyfskiet, waar laasgenoemde net oor die interne en eksterne ballistieke eienskappe gaan.

Interne ballistiese perke

'n Eerste vereiste van interne ballistiek wat deur 'n koeël vereis word om teen algemeen aanvaarbare spoed deur die loop van die geweer te kan trek, is genoegsame druk daar agter. Hou in gedagte dat die koeël baie ferm of styf in die loop moet pas, om die skadelike verby vloei van hoë temperatuur ontbrandingsgasse, te verhoed.

Hierdie genoegsame druk tesame met die vereiste dat die gas afgeseël word, lei daartoe dat aanvanklike druk pieke in die stelsel baie hoog kan wees en noodwendig nie oorskrei mag word nie, bloot om veiligheidsredes.

Die alom bekende 308 Winchester se CIP maksimum druk spesifikasie is sowat 60 000 pond per vierkante duim in die interne stelsel, tydens die afvuur van 'n patroon gelaai met 'n konvensionele loodkern / kopermantel koeël daarin.

Indien die koeël so ontwerp kan word dat die aanvanklike druk pieke tot 'n mate verlaag kan word, deur byvoorbeeld die dravlak (bearing surface) te verklein, sonder dat dit ten koste van hoë temperatuur gas afseëling sal geskied, wat sal die enkele grootste negatiewe gevolg daarvan wees?

Logies gesproke moet laer druk regstreeks laer spoed tot gevolg hê en dit is beslis nie waarheen ons mik met so 'n nuwe ontwerp nie! Die koeël wat so ontwerp is, met veel laer druk daar agter, sal dus noodwendig meer dryfmiddel benodig, wat op sy beurt weer 'n magnum slagdoppie sal vereis vir volledige en vinniger ontbranding, om sodoende meer spoed te kan genereer as net dit wat verlore gegaan het met die aanvanklike laer druk.

Met hierdie manier van doen, word dus 'n hoër volume ontbrandingsgasse daar gestel wat die nuut ontwerpte koeël teen nuwe spoedvlakke kan voortdryf.

Om weereens die 308 Winchester as voorbeeld te gebruik: 'n 130gr koeël word met groot gemak en geen teken van oormatige druk teen 3080vps voortgedryf uit 'n 23" lang loop.

Só, waar staan ons tot dusver met die uniek ontwerpte koeël in terme van interne ballistiek?

   Eerstens, laer aanvanklike druk pieke en dus minder slytasie aan die loop van die geweer as gevolg van kleiner dravlak.
   Tweedens, hoër spoed as met konvensioneel ontwerpte koeëls as gevolg van die laer gewig van die kaliber koeël weens die soort materiaal wat gebruik word in die vervaardiging van die uniek ontwerpte koeël - die voordele hieraan verbonde volg in die eksterne ballistiek gedeelte.
   Laastens, steeds geen verby vloei van ontbrandingsgasse nie en boonop verminderde loop vibrasie tydens die afvuur van die koeël. Dit volg vanweë die gebruik van 'n magnum slagdoppie wat genoeg stukrag het om die koeël reeds teen die riwwe en groewe van die loop vas te druk, baie kort voordat die hoër volume dryfmiddel ontsteek.
   Minder loop vibrasie lei tot verbeterde akkuraatheid.

Eksterne ballistiese eienskappe

In die eksterne ballistieke eienskappe van die uniek ontwerpte koeël speel hoë spoed 'n uiters belangrike rol. Nogtans is daar 'n tweede baie belangrike vereiste waaraan voldoen moet word om te sorg dat die koeël so na as moontlik aan perfek sal presteer, naamlik die keuse van die korrekte lengte koeël wat perfek sal pas by die betrokke geweerloop se spiraal (twist rate).

Die deursnee van die geweer se loop bepaal watter kaliber koeël (.308 of .375, ens.) jy moét gebruik en net so skryf die geweer loop se spiraallengte voor watter lengte koeël jy veronderstel is om te gebruik om die beste resultate te behaal.

Die koeëlgewig is van mindere belang, solank die materiaal waarvan die koeël vervaardig is, van goeie konstruksie gehalte is.

Meer hieroor later in die bespreking van terminale ballistieke eienskappe.

Die korrekte lengte koeël sorg dat die verlangde stabiliteitsfaktor (SF) verkry word om te verseker dat die koeël stabiel sal wees in vlug, tydens impak en gedurende penetrasie.

Bogenoemde aspek word duidelik in die onderstaande skets aangetoon.
In die boonste gedeelte van die skets kom die rigting waarin die koeël vlieg en die koeël se lengte-as, perfek ooreen en die stabiele vlug van die koeël sal voortgesit word tydens impak en penetrasie. Met hierdie ooreenkoms van die koeël se lengte-as en die rigting waarin die koeël vlieg, sal die koeël tot op 'n baie klein impakhoek ("angle of incidence"), steeds in 'n reguit lyn aanhou beweeg.

Dié eienskap in die boonste gedeelte van die skets, gee die jagter op sigself baie meer selfvertroue om selfs moeiliker skote met groter vertroue suksesvol te kan uitvoer.

In die onderste gedeelte van die skets kom die rigting waarin die koeël trek en die koeël se lengte-as NIE ooreen nie en hierna word verwys as die aanvalshoek ("angle of attack") wat ontstaan as gevolg van onstabiele vlug en ook verder kan lei tot tuimeling van die koeël tydens impak of kort daarna tydens penetrasie, met al die negatiewe gevolge daaraan verbonde - swak penetrasie wat kan lei tot gekweste dier en / of groot mate van vleisskade.

Watter voordele kom nou by in die eksterne ballistiek met hierdie uniek ontwerpte koeël?
   1. Platter trajek.
   2. Minder windskuif.
   3. Korter vlugtyd.
   4. Groter statiese stabiliteit.
   5. Vinniger demping van die eerste en tweede nutasie nadat die koeël by die loop ontprop.
   6. Groter reikafstand (point blank range.)

Dit maak dus die eerste verantwoordelikheid van skootplasing makliker vir die jagter en ook die skyfskiet skut.

Terminale ballistiese eienskappe

In die derde fase, naamlik terminale ballistiek, is dit nou sinvol om te vra: "Wat is die resultate van die hoë spoed, wat nou 'n gegewe is, met die besonderse koeël?"

Meer spoed gee ten opsigte van terminale ballistiek:
   1. Groter waarskynlikheid van reguit lyn penetrasie - in ag genome dat die korrekte lengte koeël reeds stabiel is in vlug en so voortgaan tydens impak en penetrasie.
   2. Meer momentum vir dieper penetrasie.
   3. Meer energie vir groter wondkanaal volume.
   4. Groter bydrae van sekondêre wondkanaal tot die wondkanaal volume.

In hierdie fase kom nou die verdere vereiste by, naamlik die materiaal waarvan dié koeël vervaardig word - slegs geringe gedeeltes van die koeël wat so in dié ontwerp beplan is, mag in die penetrasie proses afgegooi word, onder spesifiek voorsiende omstandighede.
Geen verdere versplintering mag enigsins plaasvind nie.

Dit lei dus tot die vinnige dood van die gejagte dier met die minste moontlike lyding en pyn.

Mees geskikte koeëlmateriaal

Die feit dat sommige allooie sagter is as koper, het gelei tot die navorsing van hoekom geelkoper makliker masjineer en sagter kan wees, maar tog breek wanneer dit onder stres geplaas word.

Die enigste rede waarom die meeste ander monolitiese koeëlvervaardigers geelkoper gebruik, is omdat dit maklik masjineer en 'n goedkoper rou materiaal is. Dit is dus maklik om koeëls daarmee te maak, maar die gebruik van geelkoperkoeëls is baie nadelig vir die geweer se loop.

Die feit dat geelkoper se hardheid vinnig toeneem hoe vinniger dit onder stres geplaas word, is 'n goeie eienskap in die regte omstandighede, soos met onderdele soos laers en ratte.

Die slotsom is dat geelkoperkoeëls baie goedkoper is vir die vervaardiger, maar baie nadeliger is vir die gebruiker.

Gebaseer op oor en oor bewese praktiese resultate verkry met hierdie uniek ontwerpte en uiters noukeurig vervaardigde koeël, is dit meer as genoeg herhaalbaar bewys, dat suiwer koper die vervaardigingsmateriaal is wat by verre die beste terminale resultate lewer.

Selfs in die heel ergste geval van koeël vervorming soos hiernaas gesien kan word, nadat van die dikste bene in 'n olifant getref en vergruis is, bly die suiwer koper koeël steeds heel en versplinter of breek glad nie, soos wat algemeen met geelkoperkoeëls gebeur.

Al is dié materiaal duurder, moeiliker masjineerbaar en is strawwer op gereedskap soos snybeitels en bore, bly dit steeds die materiaal wat die mees gebruikersvriendelike eienskappe het vir geweerlope en lewer ook die beste terminale ballistiese resultate.

Opsommend

Klink dit alles gans té veel na die sogenaamde "tower koeël"?

Hoegenaamd nie; die heel belangrikste aspek, naamlik goeie skootplasing, bly nog steeds die jagter se bydrae om hierdie unieke koeël in staat te stel om al die vermelde voordele, 'n werklikheid te maak.
Daar sonder is dit net 'n vinnige gesuis in die wind!

Hierdie unieke koeël bestaan reeds jare lank en bewys homself herhaaldelik elke jagseisoen in talle jagte dwarsoor die wêreld.

Koos Geldenhuys.



GUNS MAGAZINE - October 2013 -

The Speed Read

We Test An Acoustic, Electro-Magnetic And Optical Chronograph.
Each Proved Versatile And Accurate.

I have owned and used several Oehler chronographs, presently using the 35P. The unit is accurate and a marvel of electronics. Three leads run back to the receiver, which prints out each shot and records the high, low, spread, and average of the group of shots. It also calculates and records the standard deviation. It works well and is very accurate.

I have tested it against values published in various papers for barrel length and at standard conditions where I live on the coast. I use the results to input data into software programs that output the trajectory path, and using it in competition, my comeups are right on. For example, if the chrono gave false readings, say 150 fps higher than it really was, I would hit low at long range and be frustrated as to why.



The SuperChrono set up on Jake's tripod. The readout on the unit is the average velocity of that string of shots from a .308 Winchester. The arrows allow you to step through the velocity of each individual shot. The buttons on the right are used to give either fps or mps. The buttons on the bottom give average of the group, reset, and turn the unit off and on. The SuperChrono will record 99 shots at a rate of 600 rounds per minute with no missed shots.

Acoustic Chronograph
But the Oehler is a bit bulky, and I have wished for a very small, accurate chronograph I could take anywhere in the country when competing or hunting. It appears that I have found it in the SuperChrono from Steinert Sensing Systems. My shooting range is located at 60 feet elevation. The temperature runs about 75 degrees F when I shoot early in the morning, and the pressure is about 29.53—very close to standard conditions. I take the data and enter it in a ballistic software program that outputs the trajectory path. It gives me comeups in either MOA or Mils, and it tells me where each reticle hashmark will hit. Great!

But then I travel from the coast to 8,000 to 11,000 feet to either compete or hunt. The pressure is much less, the temperature different, etc. I have to guess the velocity change and trajectory path. I would have better results if I could chronograph my bullets in those conditions and then print out a new comeup table for density/altitude. But the chronographs I presently use, and will continue using, are too bulky to haul with me to the boondocks. Enter the Steinert SuperChrono Acoustic Chronograph.

The SuperChrono weighs only 10 ounces and is just 10 inches long. It has one 1/4×20-inch mounting thread, which attaches to most tripods. It will give accurate readings in any lighting conditions, rain, or snow and works from -4 to 158 degrees F. It takes readings near the muzzle, but it can also be put between or near the target, which could be used to calculate the ballistic coefficient.

Unlike optical chronographs, the SuperChrono uses acoustics. It operates by sensing shockwaves passing over sensor 1 and then over sensor 2. It works as long as the bullet is traveling at supersonic speed.

Simply aligning the unit along the barrel/target line is not the correct way to use it. The SuperChrono has sights, which are used to sight the unit at the target. I lined the unit along the barrel/target line, but then I used the sights, much like aiming a pistol at a target, as well. The unit registered the velocities I am used to seeing.

Paying attention to the instructions is not my strong suite, but it pays in this instance. The instructions include a table that tells the user the best heights to mount the unit below the barrel/target line if shooting from distances of 25 to 400 yards for various velocities. In my case, the .308 should be in the vicinity of 2,700 fps. The table suggests mounting the unit 8 inches below the barrel/target line for that distance and velocity.

If the unit is set up by these parameters, it is very accurate. In the field, a hunting trip in the Rocky Mountains, or whatever, it might be unlikely I would have a bench from which to shoot. It so happens that I have a tripod that measures 7 inches high but can be set to as low as 4 inches. In the prone position and using that bipod or a pack, I could set the unit up correctly. Since most of my hunting rifles have velocity ranges of 3,000 to 3,300 fps, the unit should be 7 inches below the barrel/target line, not hard to achieve in the field for the advertised 99-percent accurate velocity readings.


It is possible to shoot over the SuperChrono in the prone position using a small tripod.

Testing
The advertising says the unit gives readings that are 99- to 99.5-percent accurate. The next logical step was to test the velocities recorded against the Oehler.

I used both the Oehler M33 and the 35P to test the accuracy of the SuperChrono. I set the Oehlers up so the distance between the sky screens was about 10 feet in front of the muzzle of the rifle. I set the SuperChrono up just beyond that, which was about 14 feet in front of the muzzle. There is a 1.05 fps velocity drop per foot. So if the muzzle velocity of a .308 was a true 2,700 fps, the Oehler at 10 feet would register about 2,690, and the SuperChrono at 14 feet would register near 2,685 fps.
That worked!

I may have made this sound more difficult than it is. There are just four things that must be done to get accurate results:
1. Line the rifle, the target, and the SuperChrono up so they are on a parallel line.
2. Use the sights on the SuperChrono to aim the unit at the target.
3. Move the unit below the barrel/target line for the velocity range you believe the cartridge will give you, for example, 8 inches for a muzzle velocity of 2,700 fps. (The velocity ranges are given in the instructions.)
4. Move the unit away from the barrel so the distance from the muzzle to the back end of the unit is greater than the height from the top of the unit to the gun.

By Jacob Gottfredson.