Hi:
Here is an answer to your specific question.
German Army loads for the 9mm, were, through WWII, 123 gr. bullet at 1,076 fps. This was the standard brass cased load for pistol usage, not to be confused with the steel cased iron core bullet ammo used in the SMGs.
The standard NATO load of today is 117 grs at 1,260 fps.
You can do the math, but beware of shooting modern "HOT" ammo through your vintage Luger.
Sieger
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