7/8 oz. at 1200 fps, 7.5 pound shotgun = 14.4 ft/lbs of free recoil
1 oz. at 1180 fps (2 3/4 Dram), 7.5 pound shotgun = 17.3 ft/lbs of free recoil
1 1/8 oz. at 1200, (3 Dram) 7.5 pound shotgun = 23.0 ft/lbs of free recoil