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And then there is the confusing part; If the firing pin drives the case forward the case has no choice but to stretch between the case head and case body.
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Well seeing as how the firing pin dents the primer and while the case may move (depends on how the case fits the chamber me thinks and bench rest shooters like to have to cam the bolt), it also absorbs some or all of the firing pin forwarding.
And as here is a great deal of pressure extreme, said case will then drive back into the firing pin if it does move per most of our reloads.
the solid parts are the shoulder of the chamber, the chamber walls and the bolt head itself (though in fact its the lugs of the bolt that fix the bolt head in place).