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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
+P Throating
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<blockquote data-quote="Shawn Carlock" data-source="post: 2591925" data-attributes="member: 4"><p>I was thought quite alot about even posting on this thread after becoming aware of its existence because I don't like internet ****ing matches. Here was our process and testing. Anyone is free to look up the patent to see the details and application. Kirby is 100% correct that it is nothing like Weatherby freebore. It is simply a step in the rifling leaving the bullet touch point in the same location, allowing spin and engraving to be started at the same time but at a much reduced pressure. By the time you add more powder to the round to get back to normal pressure you have the benefit of more powder burnt down the barrel increasing the velocity. This is the simple part and with certain case capacity exceptions people are seeing 100-125 fps increase in velocity. I too was concerned about potential barrel life so I turned a new 338 Edge, 1000 SMK's and a pile of H1000 over to my friend Sam Millard to test barrel life. I told him to shoot it anyway that he considered normal use, test the throat burn length, group size every 100 rounds and document it. At 1000 rounds the rifle still shot under 1/2 moa, still shot 2800 fps and the throat had only moved forward .018" if I recall correctly. I stopped testing it there being satisified with the results. As a side note a few 338 Terminators with this throat design burned up early due to the reames +p section not being built to my specs where it left only .0005" to .0010" of rifling in the +p section. Correction this dimension put barrel life back to where one would have expected it to be. I got short of 400 rounds out of my first 338 Terminator barrel and just over 800 out of the second after the new reamer was produced. These rifles like any can get burned up if you shoot them hot. I believe some people damage them because they don't understand how easy it is to ruin a high performance rifle.</p></blockquote><p></p>
[QUOTE="Shawn Carlock, post: 2591925, member: 4"] I was thought quite alot about even posting on this thread after becoming aware of its existence because I don't like internet ****ing matches. Here was our process and testing. Anyone is free to look up the patent to see the details and application. Kirby is 100% correct that it is nothing like Weatherby freebore. It is simply a step in the rifling leaving the bullet touch point in the same location, allowing spin and engraving to be started at the same time but at a much reduced pressure. By the time you add more powder to the round to get back to normal pressure you have the benefit of more powder burnt down the barrel increasing the velocity. This is the simple part and with certain case capacity exceptions people are seeing 100-125 fps increase in velocity. I too was concerned about potential barrel life so I turned a new 338 Edge, 1000 SMK's and a pile of H1000 over to my friend Sam Millard to test barrel life. I told him to shoot it anyway that he considered normal use, test the throat burn length, group size every 100 rounds and document it. At 1000 rounds the rifle still shot under 1/2 moa, still shot 2800 fps and the throat had only moved forward .018" if I recall correctly. I stopped testing it there being satisified with the results. As a side note a few 338 Terminators with this throat design burned up early due to the reames +p section not being built to my specs where it left only .0005" to .0010" of rifling in the +p section. Correction this dimension put barrel life back to where one would have expected it to be. I got short of 400 rounds out of my first 338 Terminator barrel and just over 800 out of the second after the new reamer was produced. These rifles like any can get burned up if you shoot them hot. I believe some people damage them because they don't understand how easy it is to ruin a high performance rifle. [/QUOTE]
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