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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Proof Barrels And Shermans.....WOW !
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<blockquote data-quote="bigngreen" data-source="post: 2487683" data-attributes="member: 13632"><p>Yes it has, I posted it years ago on the number 2 6.5 Sherman built, before Sherman Wildcats was even a thing, with multiple powders and pressure traces showing how the time under the curve changes velocity while at the same pressures. And showing pressure signs showing up on the Sherman brass right where it should in that case 65k. Another guy has done pressure testing, I know he had some posts but I don't know where they all went cause I didn't follow for long since it was not this site.</p><p>I have the first 6.5 SS, I just threw out the original brass so I can restart with ADG brass, it had 20 firings on it. Rebarreled the #2 6.5 Sherman a few years ago with a different barrel maker and it shoots right with the first, just not a big deal.</p><p>The biggest issues I've seen in pressure spikes had been tight bored OR soft bores, powder lot changes the biggest I saw was years ago on H1000 but it didn't have to drop 4-5 grains but a couple on a big case like that.</p></blockquote><p></p>
[QUOTE="bigngreen, post: 2487683, member: 13632"] Yes it has, I posted it years ago on the number 2 6.5 Sherman built, before Sherman Wildcats was even a thing, with multiple powders and pressure traces showing how the time under the curve changes velocity while at the same pressures. And showing pressure signs showing up on the Sherman brass right where it should in that case 65k. Another guy has done pressure testing, I know he had some posts but I don't know where they all went cause I didn't follow for long since it was not this site. I have the first 6.5 SS, I just threw out the original brass so I can restart with ADG brass, it had 20 firings on it. Rebarreled the #2 6.5 Sherman a few years ago with a different barrel maker and it shoots right with the first, just not a big deal. The biggest issues I've seen in pressure spikes had been tight bored OR soft bores, powder lot changes the biggest I saw was years ago on H1000 but it didn't have to drop 4-5 grains but a couple on a big case like that. [/QUOTE]
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Proof Barrels And Shermans.....WOW !
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