SMR caliber for deer Yes, a .45 caliber Southern Mountain Rifle is suitable for hunting whitetail deer. Topics: Products_KitsTags: Southern|.45 Caliber|Returns|HuntingLast verified: 2026-08-10Also called: southern mountain rifle, southern mountain, mountain rifle, southern, smr, .45 caliber, .45, 45 cal, 45 caliber, returns, return policy, refund, exchange, hunting, deer hunting, hunt, game, big game