The only ammo I probably have more of already reloaded than 10mm is, you may guess it, .40 cal. I used the same bullets for both. Usually I use Precision Bullets coated 185 grain RFN. But....I still have a pile left of them Hornady 180 grain HAP projectiles left, and I think I want to see how they shoot out of my new Ruger. I may make me a box of pretty stiff .40 cal loads to see where they hit the target in relation to the 10mm loads.