As hunting is one of the biggest draws to Alaska, knowing the proper rifle to carry is equally important as knowing where to hunt. With the high population of bears, especially grizzlies, you want to be prepared for anything the hunt can throw at you. You can get a good caribou with a .270, .270 WSM, or 7mm Weatherby Magnum with no problem. Only if you are going to encounter something a little bigger than a caribou, you might want to think twice about the 7mm.
If a bear is attacking, you have to be properly equipped to defend yourself. Unless you are in sheep and goat country, where encounters are infrequent, you should always be ready for it. A good idea is to take something along the lines of a .338 with 200- or 210- grain bullets and keep a handful of 250- grain bullets somewhere that you can access them quickly, should the need arise.
Any of the three types of bears should be no match for a .338, .338 Weatherby, .338 RUM, or .375 H&H, with nothing lighter than 250-grain bullets in the .33-calibers, or 300- for the H&H. The same rule goes for moose. As Alaskan moose are large, a bigger rifle is a better bet to stop them in their tracks.
It’s always a good idea to bring extra supplies like scopes and magazines, too. You never know when one will break, but you do know that you will be nowhere near a sporting goods or gun store. You may want to also bring a rifle that handles rain well. There’s no shortage of that when you get out into the wilderness in the spring.
Source: Field & Stream