ammo & reliability
Be sure you are not barking up the wrong tree here. Contrary to the urban legend, the Luger does not require "hot" loads. What it does require is an adequate OAL, a lot of ammo related reliability problems are caused by the OAL being too short.
Another question is what do you have for a recoil spring? I've opend up six Lugers and found six different recoil springs, none of them original. Thor tells me he's seen the same thing. I think that in the past, due to the urban legend about the "hot" ammo, a lot of people have been dinking around with the recoil springs in an attempt to get the pistol to work with ordinary loads. The Luger will not work right if the recoil spring is wrong.
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