While I have yet to get into the field with it 44 grain HH in a .220 Swift at 4200 fps at 4000'. By the way that was the Hogdon book starting load of H380, 40.5 g. Absolutely 0 pressure signs and I went fast enough for me could have been up to ???? Tight group as well never could get the TSX to shoot in it. 1 of two loadings so far that have been overly fast but safe in my opinion others have been more believable velocity. Try faster powder in those other guns Butterbean?