Well 35whelen, perhaps it's just the bullets I'm using. In my 35 whelen, I loaded 180 grain speer flat points, and then 203 grain sledgehammers. With 4064, I'd get 2 of 3 shots that were 5/8-3/4" apart, and 1 of 3 shots that were 2-3 inches away. That was with almost every group. I switched to A2520, and almost every group with both bullets were <1" with 3 of 3 shots. The rifle is an H & R heavy barrel single shot. Laugh if you want, but them rifles will shoot very well. I'd like to blame shooter(me), but when I switched to A2520, the fliers disappeared. It was the same story with my 375 ruger. Using 235 grain spears, 2 of 3 were <1" and 1 of 3 was a flier. Switch to H100V or R-15, and the fliers disappeared. Only conclusion I can come to, is the powder just isn't working.