The powders of choice are H4350 and H4831sc. Somewhere between 51.0 and 51.7 grs of H4350 and depending on the lot of H4831sc between 53.5 and 54.7 grs.. I have found that with H4350 CCI BR-2s generally work best and with H4831sc, generally FED 210s work best. But as they say>>>>every barrel is a story unto itself. But these parameters will get you to where you want to be..