About the high pressure rounds.
The original 9mm Luger (or 9mm parabellum, whatever) round was designed around a slower burning powder that developed a pressure curve that differed from that of most modern 9mm para ammunition. I agree with Ron that modern high pressure rounds like the +P and +P+ stuff should be avoided, although a luger probably outlives that ammo longer than any other pistol (which would also be beaten to pulp with long term use).
Winchester White Box 115gr and Sellier & Bellot 115 and 124gr are rounds that stick close to the original specifications and are absolutely suitable for the luger pistols. For some milder shooting, the S&B subsonic works quite well also.
Bear in mind that the metallurgy of the older lugers (DWM, Erfurt) differs from that of the later Mauser versions and that, close to 100 years old, metal will begin to fail.
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