In an old article about Brown bears the author visited with a number of guides.. It seems the real difference in power came when I guy moved to the .375..
Bob, When I first came to this valley, one of the old time Alaska brown bear and polar bear guides, had a ranch here.. I had the good luck to visit with him several times, and also do some hunting with him.. I know it sounds crazy, but his backup gun was a .270, at least on a couple polar bears...
