Was using 777 pellets and American Pioneer FFG. Used Powerbelts (which grouped best with 3 777 pellets, , 348 grain, around 5"), and 250 Shockwaves) 90 to 125 grains of AP FFG, 2 and 3 pellets of 777, and some other different rounds I have collected over the years. 5" was best I could get, not done yet. This was with open sights, which I have to use in Kansas BP deer season.......