Long before the 375 Ruger came out, the Whitworth 375's were highly popular with guides. For Christmas bonus the year After the 416 Remington came out, I offered to have a couple of my guide's well worn 375's rebored.
They didn't like them 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.