Steve Marshall comments on firing an empty primed case in an earlier thread titled: "Firing a primer in an empty case?"
And with live rounds, too. When the powder burns and raises pressure towards maximum, the back of the case stretches back a little but the primer pushes out of its pocket a few thousandths. As pressure peaks and the case head gets pushed back against the bolt face, that seats the fired primer flush with the case head.
PS:
I've no idea why this thread was locked. Must be a sensitive issue to some folks for some reason.
Facts are, with rimless bottleneck cases, the shoulder gets set back a few thousandths. This happens with live primers as well as deactivated (soaking them in water for a few minutes) ones that just "click" instead of the loud pop of their primer detonating.Some shoulders might get moved forward.
And with live rounds, too. When the powder burns and raises pressure towards maximum, the back of the case stretches back a little but the primer pushes out of its pocket a few thousandths. As pressure peaks and the case head gets pushed back against the bolt face, that seats the fired primer flush with the case head.
PS:
I've no idea why this thread was locked. Must be a sensitive issue to some folks for some reason.
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