George:
Let's try something new. Load up only 5 cartridges and see if you can get through all of them without a jam. If so, the OAL of your cartridges is probably too short for reliable feeding through a Luger's magazine, which, for reliable feeding needs a round nose cartridge of 1.173 inches and a truncated cone at 1.15 inches.
Also, your ammo could be too hot for your the Luger, which was loaded at 123 grains to 1,076 fps during the period you have (a 1916). Please check your ammo and get back to us.
Sieger
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