Welcome.
Lugers are known to be "ammo sensitive", so most likely that is the problem. Magtech 115grs has worked well for me, and I�´m sure other members will let you know what have worked best for them also.
Not enough lube or "limp wrist" could also be part of the problem. I have found mine to do this if I dont hold it tight enough.
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Regards:
Ingvar
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