It is a seemingly established fact that you need to break-in a gun with a sufficient amount of ammo for reliability testing. Agreed. Some say at least 200+ rounds or more. Using the ammo you plan to run, normally, even better. But, let's say you want to run a bunch of HP ammo (after running a bunch of regular stuff for the reliability portion) to check to see how the gun runs using HP. If you run 50 or more HP rounds without issue (after already running 100s of RN ammo) would you be satisfied? What about that many (or more) of one brand? Would you then be happy with HP reliability in general, or would you hold out for that specific ammo used ONLY and not just all HP? Opinions, please. Wanna kill these ads? We can help!