Greetings, I am new to the HK Forum. I just bought an HK P7M8 and just love the gun. What 9mm ammo works best with this pistol's unique rifling?
The P7 series was designed before all of the advance 9mm ammunition we see today. Back then 115 grain FMJ was the norm. That is what I shoot. Anything between that and 124 gain is fine. Do not use anything higher, like 147 grain, or +P or +P+, as it will create overfunction and lead to parts wear and breakage.