Federal primers flatten, crater, mushroom, even pierce, at and below starting load in my Glock 33 357sig. I've loaded Power Pistol down to starting 9mm loads in my Sig and they still flatten/pierce/crater.
Federal are probably just fine in "old school" rounds making 18 or 20,000psi but I'd consider them unsuitable for anything in the 30,000+ psi range.
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