Personally, I don't own any of the calibers listed in the article. The heaviest rifle I have is a .308 Winchester. I like it because ammo is cheap for range day practice and plentiful. If the world falls apart, I can use 7.62 NATO ammo. I shoot well enough that I can take animals out to 500 yard or so for moose and caribou. For bears I'd not shoot past 300 yards or so. It's not big enough for bison or polar bears, but I'm not planning on hunting either. I always have a sidearm (.44 Magnum) in case something decides I look tasty.