My rifle is a M70 with a 30 inch ABS wrapped Rock 5r 1-8 twist. 107 grain SMK's shoot great with H4350 powder but I get pressure at 3150 fps with this load. I might as well shoot a 243. I've shot RL-22, RL-25, Retumbo, H4350, and 4831 powders with 87 V-Max, 107 and 115 SMK(DTAC), 95 B-Tip, 105 and 110 Wildcats, and 105 A-Max. The A-Maxs shoot great at 3275 but blow up after a few rounds. The Wildcats never got to the target at 3100 fps and nothing else will consistently do better than 3/4 of an inch. Even when I've gotten decent groups at 100 yards the SD and ES are always bad. The SMK is a decent bullet out to around 600 yards so I shoot these because I'm tired of shooting out my barrel for mediocre loads. I've got some 105 Bergers so I thought I might try these. A slower twist with lighter bullets going like hell seems to be less picky from what I've read.