It did pretty good with anything I tried from Knight and T/C, but it really shot the 300gr SST with a (just a little over max, it's up to you though) charge of 130gr 777 3F loose powder. I'm talking one hole groups at 100 yds, for 5 shots. Didn't matter whether I swabbed the barrel between shots or not. I'll tell you though, if you have loose teeth, false teeth, or an aversion to some stiff recoil, that load isn't for you. Make sure your scope has enough eye relief, at least 4", or you're gonna get cut.