I've pierced a number of primers before, just can't remember if it was old ammo or my reloads. Seems I figured out at some point that the older primers were made of much heavier metal so the older guns had either longer firing pins or heavier springs. My guns that really dent the primers are hammer guns with very rounded tips, which I figured were made that way so they would get reliable ignition with the older heavier primers so they really deform the newer thinner cups. Anyone else notice that? My old Remington hammer gun REALLY puts a big round dent in any and all primers, old or new. I guess I should dismantle some old and new primers and take a caliper to them. It wouldn't surprise me at all if some of the piercings are caused by irregularities in the primer cups. Those things must be punch formed and subject to having a thin spot now and then.
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