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Mr. Guffey, I've told you several times before putting how I've measured that in several posts over the years in this forum. But it involves something you think is not a valid measurement, so that's why I think you don't plant it into memory; you forget about it because it, to you, is nonsensical.
With your claimed expertise in machine shop gunsmithing tools and practices, I would think it's easy figure out how much a case shoulder's set back from firing pin impact and not even shoot a bullet down their barrel.
Think about it; it's a before and after issue with a primed case.
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