Darivs:
Trying a new magazine sounds like a good first step. The object will be to eliminate the variables, one by one, until the problem is cured.
Also, you can forget about a perfectly reliable function with your Luger unless you reload for it.
The ammo commercially available is not long enough for proper feeding in the Luger's step-feed magazine, so don't expect perfect function with this ammo, in any event.
The typical Luger jam, breach jamed over a cartridge half way out of the magazine, can be caused by numerous problems: mag. spring too weak, load too weak, load too strong, improper cartridge length, mainspring too strong, mainspring too weak, and there are more yet.
Typically, unless someone has tried to "fix" the problem by changing or cutting springs, the cartridge OAL seems to be the "usual suspect".
Yours is a mismatched pistol, so you have yet another variable to the equation.
Sieger
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