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I suspected the issue had something to do with total headspace tolerance and the depth of the head to top of the web--the only thing unknown from your measurements is if it is possible that there was some compression due to firing--a possibility at higher pressures.
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"Everyone speaks gun."--Robert O'Neill
I am NOT an expert--I do not have any formal experience or certification in firearms use or testing; use any information I post at your own risk!
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