From the regs sitting in front of me. must be at least .40 caliber in size. If hunting pronghorn or deer, bullet must be 130 grs. or heavier. Sabots must be 170 gr. or heavier. Elk, Moose, Bison, Bighorn Sheep, or Mountain Goat.you must use a 210 grain or heavier bullet,or a sabot that's at...