I would do a chamber cast first to see what the chamber actually looks like before going in with a reamer or just pull an unfired round and see if the bullet has rifling marks. The Luger (and imitators) action is not always reliable in seating the round in part because cocking the firing pin takes away energy right at the critical closing point (unlike a hammer gun, where hammer cocking is done on the rearward stroke).
Jim
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