I would go with a 340 Wby. Mag. using Weatherby 225 gr. Barnes XFB, Federal 225 gr. Trophy Bonded Bear Claw, or Weatherby 250 gr. Nosler Partition. If you go with the 338 Win. Mag use Federal 225 gr. Trophy Bonded Bear Claw HE, PMC 225 gr. Barnes XFB, Rem. 225 gr. Swift A-Frame, Win. 230 gr. Fail Safe, Federal 250 gr. Nosler Partition HE. Good luck.