I'm shooting them out of an AI AT with a 12 twist, 20" Barrel. Lapua brass, 210m, 44gr varget, right at 2550 fps. No pressure. 2.90 OAL. Decent groups, a little over a half inch but I haven't played with the load much. 5/5 hits on an 18" plate at 1k so they're stabilized in the 12 twist just fine. I think they're the highest bc bullet in the 180gr range.