Just the normal XP2 Winchester 7mm-08 softpoint. Stuff they sell at walmart. And yep, i let it cool down. 3 shot groups about 45 seconds in between. The big issue is it is throwing the bullets everywhere. NO consitency at all like to the right or letf. always just all over the place. Ammo is my next shot at fixing. Using Hoppe's #9, break free and gun scrubber.