I've been using the Remington 180 grain umc flatnose cartridge for range work. I find that it is very consistent, and reliable round for that work. Bottom line...zero problems. Every other trip I put my daily carry rounds (Hornady FTX CD) through, just to be sure. I shoot six rounds through to make sure they cycle OK..Yes they do!. I can not remember any failures with this pistol. Think I'm up to about 500 rounds at this point. 8)