As expensive as the stuff is (bottle is 10 oz instead of 16), I would start at 90 grains and work up from there. My elk load this year is with 90 gr of BH 209. Plenty of power, and if you can get accuracy at lower volumes, why not save the money and your shoulder?

My last group this weekend was 2 & 1/2 inches at 100 yards after aprox 25 shots/no cleaning of barrel or breechplug. I quit with that group!