The fact is that an Alaskan Brown Bear is 1,000 pounds, large bones, thick skull, heavy muscles, and requires a lot of stopping power.
"The normal range
of physical dimensions for a brown bear is a head-and-body length of
1.4 to 2.8 m (4.6 to 9.2 ft
) and a shoulder height
of 70 to 153 cm (28 to 60 in
"an adult brown bear in
nearby coastal Alaska
living on a steady, nutritious diet of spawning salmon may weigh
as much as 680 kg (1,500 lb
Alaskan author Larry Kaniut has a framed photo in his home of a man who survived a bear attack standing next to the stuffed/mounted bear which is also standing. The top of the man's head is just past the middle of the upright bear.
Just because Larry has documented a bear attack where a person defended himself against a bear with a folding Buck knife does not mean that I carry a folding Buck knife for such a purpose.
If you want to read about actual bear/man encounters I suggest reading one or more of Larry's books.
So, to recap: in Alaska a "normal" Brown Bear can weigh 6 - 10 times more than most men, when standing tower between 3 - 4 feet over most men, and is almost as tall as many men standing when it's standing on all fours.
Then you can consider the record/larger than normal specimens.
"This nine year old girl from the Yukon shot this record brown bear in Alaska on the Alaskan Peninsula in October 2006. Skull size – 33 1/16, 11 feet 9 inches nose to tail, estimated weight – 1,800 pounds. Supposedly this was her first ever bear hunt."
Read her father's link, it was a little smaller; really very little.
So, where I live and hike, no .45 auto for the great outdoors.