So far I've settled on 67gr of R22 and a Hornady 180gr BTSP. I haven't run it through a chronograph yet but it's probably about 2800-2900 FPS which means nothing as it groups well under an inch at 100 yards and I rarely have a shot at a deer farther than that. Next up is looking at 200gr Accubonds. If I get lucky and draw a Michigan Elk tag this is the rifle I'll take.