I swore by the BH209 and then had a partial ignition on one shot. Not sure what happened but I was using the W209's and everyone had shot fine. I let the powder set for 4 days in the ML'er since ive never had issues with this before and when firing that day it just flopped the sabot out. Im not sure what happened. Its good stuff and I shot 1-2inch groups at 100yards with it with a 250grain shockwave and 115grains of BH209

But now im back to T7 and 100 grains and im shooting 1.5-2.5inch groups at 100 yards. No huge grouping difference. Its loads of things that factor into groups such as wind, trigger pull, and your rest. But anywhere from 90-125grains and a 250-300 grains sabot seem to work well. Try the shockwaves though