[DonVoigt]

"Every thing I've tried has worked, never had a failure."

In a luger pistol or your P89 or something else?

I have found multiple failures with multiple .30 lugers from NOS Winchester, Peters, Remington, and most any brand of .30 luger cartridges.

The overall length is critical, as is the "power" or velocity; the Old Model Parabellum will be more forgiving of weak ammo due to its leaf springs, as opposed to the New Model '06 or other using the coil mainspring.