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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
.30 GIBBS is finally ready ...
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<blockquote data-quote="nicholasjohn" data-source="post: 1899429" data-attributes="member: 109113"><p>I think that's pretty typical. Mine also does that with the 30-06 Ackley. This is why somebody suggested using 280 Remington brass, which is 1mm longer. When the shoulder and forward case body fill out, some of the brass comes from the neck. Some also comes from the body, potentially leaving a stretch mark down near the web. This is why a lot of guys wipe the case body with a light lubricant prior to fire-forming. I never did that, but I may not be a bad idea. If I was to employ that concept, though, I would consider reducing the load a tad, since this is said to increase bolt thrust. When the case walls don't grip chamber walls, more of the pressure goes backward against the bolt. At least, that's the concept. I don't know if the increase in back-thrust is significant or not. Has anybody out there found a way to test this concept ???</p></blockquote><p></p>
[QUOTE="nicholasjohn, post: 1899429, member: 109113"] I think that's pretty typical. Mine also does that with the 30-06 Ackley. This is why somebody suggested using 280 Remington brass, which is 1mm longer. When the shoulder and forward case body fill out, some of the brass comes from the neck. Some also comes from the body, potentially leaving a stretch mark down near the web. This is why a lot of guys wipe the case body with a light lubricant prior to fire-forming. I never did that, but I may not be a bad idea. If I was to employ that concept, though, I would consider reducing the load a tad, since this is said to increase bolt thrust. When the case walls don't grip chamber walls, more of the pressure goes backward against the bolt. At least, that's the concept. I don't know if the increase in back-thrust is significant or not. Has anybody out there found a way to test this concept ??? [/QUOTE]
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.30 GIBBS is finally ready ...
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