Alaskan brown bear guide Phil Shoemaker wrote of his endorsement for the .30-06 as a brown bear gun in the March/April 2014 issue of Sports Afield, but he used a very strange example from the field to do so, in my opinion. One that served to dispute his own claim. He was following up on a client-wounded bear. He came upon the bear 'at 20 feet' and shot it five times but it kept bouncing back up and coming. (Must have been some world-record bolt cycling if the bear was truly at 20'.) Five into the bear from the '06, 220 grainers, and still it kept coming. His 6th shot broke its neck. Who thinks this is an endorsement? It's a cautionary tale, "Carry enough gun." Which in this case was clearly not the '06. That ol' veteran was lucky to see the sunset that day. Is there anyone on here who can't imagine what could just as easily have happened between his 1st and 6th shot? Or if the 6th shot hadn't been so surgical?
I'd say the .30-06 is to North America what the .375H&H is to Africa. The best all-rounder out there. With some circumstances in some places strongly recommending something more.