Hi,
If, after you have found an appropriate powder charge, your pistol wants to jam, when trying to fire from a full magazine of 8 rounds; its probably your cartridges' over all lengths. The commercial stuff is all way too short for proper Luger function, so expect jams with it when shooting from a fully charged magazine.
Please see my sticky on determining proper O.A.L. when using a new type of bullet in Luger reloading, as this should be helpful. The original DWM round nose ammo was loaded to 1.173 inches.
Also, you may be able to get your Luger to function with light charges of fast powders, but if you really want it to shoot accurately, I'd try medium to slow powders. Power Pistol and IMR SR 4756 (if you can find any), should be up to the task.
Good luck!
Sieger
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