I tried several different powders and finally gave H380 a shot when I got 8 lbs. at an auction. My search was over. With 4 different 55 grain bullets and 2 different guns, a Tikka and a Stevens 200, 39.3 grains has worked great for me. Bullets I've used are the Sierra #1360 ptsp, the Sierra 55 HP, the Berger 55 match HP and the MidSouth 55 Extreme.