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It pays to know what the manufacturer suggests regarding amunition.

When I bought a P7M8, I shot whatever I happened to have, 115 gr, 124, 125, 147.

One day at the range, it started acting up, feeding issues, extracting, etc. I read in the manual that HK had designed the pistol for 124 gr. I stuck with that thereafter; no more problems.

I did have it go dead one day, no bangs. Some little black doohickey had broken inside. I called, on Monday, Fedex'd it next day air on Tuesday, got a call on Wednesday that it was all fixed, inspected and cleaned, and received it Thursday, next day air. Very impressive!