What sports car should you use to transport six 55 gallon drums of oil?
____________________________________________________________
What that said, I would interject that IMI makes a few in 44 magnum and 50 AE, but they are huge, heavy and most men don't carry one.
I live very close to a high concentration of Grizzly bears and I know a LOT of outdoors-men who fish, hunt, trap, horse pack and back-pack around them, myself included.
In the 90s the US Fish and Wildlife said we had more Grizzlies per square mile in N.W. Wyoming than anyplace in N. America, and perhaps anywhere in the world.
I know of exactly zero who carry auto-pistols as "bear guns".