30-06, 300WM, 338WM, 375HH, 45-70, 458WM, 12 gauge slugs (though there arent that many slug hunters, mostly used for protection, but widely available)
When it comes to guns and hunting don't think of Alaska as the barren wilderness. People up here shoot a lot, so there is a lot of ammo availability. Where else can you buy handguns in walmart? (and k-mart, and fred meyers, etc) Lots of gun shops, many hardware stores carry ammo, pawn shops, everybody.