I just returned 3 weeks ago from a Caribou trip toNorthern Quebec with three of my buddies.Most of the other posts are spot on. Expect tons of walking on the uneven, rockyand at times spongey tundra.The three guns we had were .257 Weatherby, 270 wsm and a 30-06. All three of us harvested 2 bulls in very similar situations, one close shot and one rather far shot. I shot my trophy at 252 yds. (according to the range finder) with my 30-06. All three of these calbers were very effective on our trip. Be safe and enjoy yourself !