Eskimos regularly kill polar bears with a .22.
I have been told that hunting a polar bear alone with only a bow and arrow gives the bear a 50/50 chance. This would be true sport. Lucky I don't care for sports that much.
Well, I read that story about a sharpened rib bone twisted into a circle and frozen in a ball of animal fat. The bear swallows the ball of fat, the fat melts and instant perforated stomach.
I think the bullet in the brain is more humane. But I'd make sure I was a good shot.
Polar bears can yank a 600 lb seal out of the water and hurl it through the air - just by grabbing it by the nose with one paw. I'd like to see the Gubernator do that!