wooohoooo!! I got it!
70gr BH209 - 295gr powerbelt didn't do very well @ 50
Upped my charge to 80gr BH209 with the 5gr JSG 3f booster charge. Next 3 shots a nickle covered them with room to spare!
I'll tell you though, just upping the charge 10grains really added quite a bit of kick to the rifle. Shes ready to go now!