Since it "works" correctly part of the time, I think it is more likely you are not holding the luger firmly or it is binding or needs lubrication.
I would think the PPU ammo is ok.
I would also like to know what "cover the slide" means.
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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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