Well I've been messing with casting some pellet and my mk2 impact 600 mm running a tungsten hammer a 720 plenum and a extra power plenum I turned down the pieces in the pellet mold so the complete skirt is filled with lead there dropping at 56 gr my reg is set just under 160 bar found the pellets running right around 920 fps for a magazine before I hit the regulator it's shooting pretty good at 50 yards have to do some more testing but so far it's promising