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higgite · May 16, 2019, 11:53 PM

First, let’s define “when rounds fire” to be when the hammer falls (or striker is released). For a typical “standard” size cartridge in a typical “standard” size chamber, the case head will be off the bolt face because the cartridge’s momentum will push it forward when the bolt stops. That is, unless the shooter points the muzzle up before he aims and fires.

Second, let’s define “when rounds fire” to be when the primer ignites. For a typical “standard” size cartridge in a typical “standard” size chamber, the case head will be off the bolt face because the firing pin will push it forward before it crushes the primer.

So, in summary, unless there are extenuating circumstances, the case head is off the bolt face when the round fires. That’s my story and I’m sticking to it.

May 16, 2019, 11:53 PM	#31
higgite Senior Member Join Date: October 21, 2010 Posts: 1,025	First, let’s define “when rounds fire” to be when the hammer falls (or striker is released). For a typical “standard” size cartridge in a typical “standard” size chamber, the case head will be off the bolt face because the cartridge’s momentum will push it forward when the bolt stops. That is, unless the shooter points the muzzle up before he aims and fires. Second, let’s define “when rounds fire” to be when the primer ignites. For a typical “standard” size cartridge in a typical “standard” size chamber, the case head will be off the bolt face because the firing pin will push it forward before it crushes the primer. So, in summary, unless there are extenuating circumstances, the case head is off the bolt face when the round fires. That’s my story and I’m sticking to it.