Besides the Sharber articles in the NRA magazines, Jay P Williams wrote a fantastic book, Alaskan Adventure, that describes a number of adventures he and Sharber experienced.
Used books are easy to find online and pretty cheap as well

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.