You may well find that a new, correct mainspring will solve your problem. As a spring undergoes compression and release, it will heat up somewhat, and if the spring in your Luger has reached the end of it's livelihood, it will begin to fatigue, and become less efficient. A Luger is such a balancing act of springs, mag, and ammo.
Also check the feed ramps on the frame and barrel to be sure that they are smooth so as not to slow down the feeding cycle. Good luck!!
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