Not too surprising. The fast powders seem to burn much hotter at high pressure than the slow powders, resulting in a lot more lead melted/gassed off the bullet base. Definitely adds to the leading, and probably doesn't help accuracy. I tried to run IPSC major loads in a 357 with 158s and W231. (Just trying to use up some W231 I had on hand.) Would shoot one course, then brush the bore. Lead would strip off and shower out of the barrel, often in long thick strands! (These were decent, hard cast bullets that showed no signs of this with 2400 or other slow powders.) Had similar results with hotter loads in 45ACP, so I went to slightly slower powders with better results.anonanon said:I found it neither better nor worse than the other hot, light-load powders (Bullseye, Unique, HP-38/231). I did not like it with heavier loads shown for magnums; it showed pressure and leading signs as well as accuracy loss.