I am from Northern Alaska, I hunt brown and black bears, caribou and moose on the open tundra. Sitting on the tundra you have 5+ miles visibility. My only rifles are chambered in 7.62x54 and .30-06. I want a rifle that I can use to reach out a little farther then my .30-06. I want something that shoots relatively flat. In the winter I haven't had much luck with rangefinders, probably due to the combination of snow, ice glare and sub -20 temps. Will a 7mm win mag cut it out to 5-600 yards or should I look at rifles in 7mm RUM?