The issue I have now, the rifle as it came stock, with this new load( Nosler 50 gr Ballistic tip Varmint over IMR 4064) shoots 20 shot group at 100 yards of .397. I am inclined to not mess with a thing, except try the Nosler Varmint 55 gr bullet and the 60 grain. Why 20 shot group? well in the real world shooting 22-250 at ground hogs, coyotes, you dont stop with 3 rounds. So I let go 20 at the target and this gives an excellent statistical base of the performance. took an hour to shoot, cleaned barrel at 10 and 20 rounds.