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To anyone who thinks that when the firing pin strikes the primer, then the complete package including the case, powder and bullet takes off in an attempt to out run the firing pin doesn't happen, strip the extractor and inline ejector from the bolt of an action, cock the firing pin, put the action front up, lay a primed case on the bolt face then pull the trigger. That primed case will jump up several inches out running the firing pin.
Same thing happens in the chamber with a loaded round except it's stopped by the case shoulder slamming into the chamber shoulder which holds the case in place while the firing pin dents the primer enough to compress then detonate the priming compound. When this happens, sometimes the case shoulder's moved back a few thousandths so there's more head clearance from bolt fact to case head that there would be if the firing pin had not smacked the primer.
How much primed case shoulders are set back from firing pin impact can easily be measured with case headspace gauges before and after popping that primer in a chamber.
Guffey, if you challenge this fact, you've got a lot to learn. Period!!!!!!!!!!!
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