You got me thinking about an old article about two guys hunting Polar Bear up in the Hudson Bay Country with .300 Savages. Apparently before the hunt they felt the 180 grain bullet in the .300 Savage was adequate. After being charged by the bear and the passage of time the author feels a little bit different. The difference was that the hunt took place in 1937 and the book was copyright in 1970. A lot changed over the 30 plus year period.
The author and his partner fired a number of shots at the bear, but only two shots from the author hit the bear. One in the fat between the skin and the spine. The other shot immediately killed the bear. It hit the bear in the forehead shattering the skull.
In the final analyzes shot placement was the critical factor and not the number of rounds find. The difference between a black bear and a polar bear is like comparing being hit by a VW Bug versus a 82,000 big rig. They can both kill you. It is like the big rig will do it faster and create a bigger, bloodier mess.
*DANGER! Explosive True Adventures of the Great Outdoors. Author Ben East. copyright 1970 by Outdoor Life. SBN 0-525-08855-5