Toby go the rifle that points and handles best for you. The 375 will do all you want. The 458 has more oomph. However if it is slower getting on target all the horse power in the world is not going to help you if something goes wrong ang you cant get it on target in time. In Aust you can also chase a few pigs most will be close range but the odd long shot will present so 375 is the front runner.