The Killdeer Mts and badlands (Little Missouri River) has both muley and Whitetail with big rack lived there 6 yrs and only 2 buck tag one whitetail (small buck was my first year there) and other was muledeer (nice muley opening day never scored it but 29 inch 4x5) I know bigger ones in area I mentioned but be prepared to walk and even pack very rugged country for sure.