I believe the original thread on this post was related to the manufacturers pushing the newer, bigger, more powerful chamberings. If we were to really think about it and be honest, except for the big bears here in NA or dangerous game in Africa and other places, you don't need a heavy magnum rifle. I believe the only exception to this would be sheep hunting (including mountain goat). I say this because the habitat they live in may require you to take a shot longer than you normally would and you want to try and drop them where they stand so your trophy doesn't fall off a cliff and get mangled or otherwise busted up. I know a .270, .280, 30-06 will easily take one of these animals. But here I think the 7mm Mag and up would be a better choice.
Having taken quitre a few big game animals both east and west of the Mississippi at ranges from "in your face" to "way out there" mostly all with a .270 Win I think I can speak from experience.