I'd recommend you try again with Winchester white box or Mag tech or Blaser brass or S &B ammo, all 115 gr. loadings.
The problems you report are often linked to "weak" ammo. I have no idea who made or makes the Herter's private brand.
Try at least two brands before you blame the pistol.
Do be sure it is oiled well.
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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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