I use IMR4831 and am satisfied with 31oo fps from a 160 partition. At the time I started loading for the big 7 the only powders readily available were this and h4831 and H870. The IMR was the best. H4831 was not as consistent lot to lot and I couldn't find or didn't want large conners because I was moving frequently. Still use IMR 4831 even tho 7828 might yield slightly more velocity.