For range ammo? Pretty much whatever's cheapest. However, at this point I am avoiding the Remington UMC "Mega Pack" yellow box of 250 rounds. In my 9c they just dribble out of the ejection port and they won't cycle my 9mm 1911. That ammo is WAY under powered in my opinion. YMMV of course. For carry, since I shoot mostly 115gr at the range, I like to carry a 115gr as well.