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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Bullet failure article
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<blockquote data-quote="keithcandler" data-source="post: 141310" data-attributes="member: 3728"><p><strong>Eyes Wide Open............</strong></p><p></p><p>Recently, I was shooting a 7 STW with the 140's going 3650 out of a long barrel 3 Groove Pac Nor barrel. My back stop was a large round hay bale. This rifle is extremely accurate to say the least and I only use a small target to shoot at. The hay bale is only 6 or so inches behind the target. After a couple of shots, I noticed that the hay was smoking, my bullets were impacting the top edge of the target. The hay was actually being set on fire by the hot bullets! Since I was using a 8-32 scope, it was clear to see, shot after shot!</p><p></p><p>Years ago, I was friends with a couple of guys Steve Chernicky and Gene Harwood. Steve built all of the Olympic 22 rimfires that beat the tar out of Russia, Gene was one of the head chemists with Shell Motor Oil had more than 100 sets of custom bullet making dies. They were involved with Bill Davis of Arbedene Proving Grounds in the development of a new Rim Fire ammo that was shot in the Olympics that we now know as Federal Gold Metal Match 22 Rim fire.</p><p></p><p>They also worked on developing new bullets for the Cross Country Ski event in the Olympics. There were many developments in gun industry that we now enjoy.</p><p></p><p>One of the things that Bill Davis found out is that the base of a certain brand of bullets deform on the long VLD boat tail bullets due to rotational stresses. They took pictures of the 105g 6mm as it exited the barrel. It all came down to alloy content of the core &amp; jacket thickness. </p><p></p><p>Steve had a batch of lead wire made up at the foundry that had 5% tin in it and it eliminated the entire mess of boat tails collapsing. I got a bunch of the lead wire and loved the way that it improved the accuracy on my 70g boat tail bullets shot at 4000+ fps.</p><p></p><p>There is another issue that no one ever speaks of and that is that the bullet heats up from friction with the air, which is what was happening with my 140g bullets shot out of my 7 STW. There is a huge difference in performance on big game between the standard 140g NOsler Ballistic tip and the 140g Nosler Winchester Combined Technology bullet due to the coating on the CT bullet. The coating on the CT bullet helps reduce friction with the air, thus the core is harder when it impacts the animal. The 140g CT bullet works every shot on deer while the std 140's do not. Not to mention that you can shoot the CT bullet much faster due to the decreased friction in the barrel, it simply does not build the pressure that the naked bullet builds allowing you to shoot them much faster!</p><p></p><p>In sumary, some of the 6 mm long VLD boat tail bullets of a certain brand collapse that are made from J-4 jackets due to rotational stresses above 3050 fps, it does not seem to to happen to Sierra bullets due to thicker jackets and higher antimony content.</p><p></p><p>Bullets do indeed heat up in flight due to friction with the air, but there has to be a relationship with speed.</p></blockquote><p></p>
[QUOTE="keithcandler, post: 141310, member: 3728"] [b]Eyes Wide Open............[/b] Recently, I was shooting a 7 STW with the 140's going 3650 out of a long barrel 3 Groove Pac Nor barrel. My back stop was a large round hay bale. This rifle is extremely accurate to say the least and I only use a small target to shoot at. The hay bale is only 6 or so inches behind the target. After a couple of shots, I noticed that the hay was smoking, my bullets were impacting the top edge of the target. The hay was actually being set on fire by the hot bullets! Since I was using a 8-32 scope, it was clear to see, shot after shot! Years ago, I was friends with a couple of guys Steve Chernicky and Gene Harwood. Steve built all of the Olympic 22 rimfires that beat the tar out of Russia, Gene was one of the head chemists with Shell Motor Oil had more than 100 sets of custom bullet making dies. They were involved with Bill Davis of Arbedene Proving Grounds in the development of a new Rim Fire ammo that was shot in the Olympics that we now know as Federal Gold Metal Match 22 Rim fire. They also worked on developing new bullets for the Cross Country Ski event in the Olympics. There were many developments in gun industry that we now enjoy. One of the things that Bill Davis found out is that the base of a certain brand of bullets deform on the long VLD boat tail bullets due to rotational stresses. They took pictures of the 105g 6mm as it exited the barrel. It all came down to alloy content of the core & jacket thickness. Steve had a batch of lead wire made up at the foundry that had 5% tin in it and it eliminated the entire mess of boat tails collapsing. I got a bunch of the lead wire and loved the way that it improved the accuracy on my 70g boat tail bullets shot at 4000+ fps. There is another issue that no one ever speaks of and that is that the bullet heats up from friction with the air, which is what was happening with my 140g bullets shot out of my 7 STW. There is a huge difference in performance on big game between the standard 140g NOsler Ballistic tip and the 140g Nosler Winchester Combined Technology bullet due to the coating on the CT bullet. The coating on the CT bullet helps reduce friction with the air, thus the core is harder when it impacts the animal. The 140g CT bullet works every shot on deer while the std 140's do not. Not to mention that you can shoot the CT bullet much faster due to the decreased friction in the barrel, it simply does not build the pressure that the naked bullet builds allowing you to shoot them much faster! In sumary, some of the 6 mm long VLD boat tail bullets of a certain brand collapse that are made from J-4 jackets due to rotational stresses above 3050 fps, it does not seem to to happen to Sierra bullets due to thicker jackets and higher antimony content. Bullets do indeed heat up in flight due to friction with the air, but there has to be a relationship with speed. [/QUOTE]
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