Pierced primers are caused by a too long firing pin, or one with a rough tip.
In a Broomhandle there should be a spring on the front of the firing pin to cushion the impact and retract the pin, if it is broken, short, or missing, it could contribute to a pierced primer.
High pressure does not cause a pierced primer; perhaps a flattened primer.
PPU ammo should be just fine; assuming your broomhandle is in proper condition and the headspace is correct.
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03man(Don Voigt); Luger student and collector.
Looking for DWM side plate: 69 ; Dreyse 1907 pistol K.S. Gendarmerie
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