I have known one Kodiak bear guide who preferred his 270 and had one client on the peninsula who had no problem killing a large boar with his 270. I have personally killed a few large brown bears with the 30-06. Including two charging bears and the legendary Kodiak guides Pinnell &Tallifson recommended the 30-06 in their brochure.

Anything larger and more powerful that those two will work just fine !

Phil Shoemaker
Alaska Master Guide,
Alaska Hunter Ed Instructor
FAA Master pilot
www.grizzlyskinsofalaska.com

Anyone who claims the 30-06 is not effective has either not used one, or else is unwittingly commenting on their marksmanship.