Under heavier boolits for a given cartridge it really shines. Was shooting some 170 gr. boolits over 8.7 gr. of HS 6 in .357 and had excellent performance. About 1070 fps and nice groups. 11 grains under a 250K boolit in 44 mag was also a winner. And this powder meters much better than Unique. I ordered an 8lb. jug when I got back from the range.