I know of no one that recommends shooting NATO, +P, or +P+ ammo in a Luger. Stick with standard velocity ammo, and you should be fine.
I, personally, have had good luck with Winchester white box 115gr FMJ 9mm ammo, and PMC 115gr FMJ ammo. Both are fairly easy to find and affordable.
Many have had problems of malfunctions with Remington UMC ammo in their Lugers.
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