I built a 700 Rem, with a Shilen 1 in 10 twist, best match(SS) grade barrel, Rem varmint taper, to shoot 69 gr SMK's and 52 gr SMK's. W-W brass, Fed 210M primers. Excellent results with several powders, but the best powder for either bullet is H380, hands down. I had some new Lapua brass prepped and laying around. Decided to try it last Sunday. Dropped the W-W load(69gr SMK) down .2 to 33.7gr. H380. 1st 3 shots into one tiny ragged hole, 4th shot left 3/8" and 5th into the hole with the other 3. 2" group at 300 Yds, 10 shot group. For me, H380 is THE powder. Cheers, Ottway