I've shot a few hundred of the 130 SMK's and settled on 42.8 of H4350, Lapua brass, and CCI 450's. I don't usually measure OAL but the BTO was 2.138, about 40 thou off. Runs about 2830fps. Very accurate, with single digit sd's. Shot them out to 1100 yards, no problem. Still have a few hundred...