I just thought others might be interested in this account. A local Eskimo hunter in Wales AK took a ten foot Polar Bear with a 22LR rimfire with one shot behind the ear at 20 feet. Killed it instantly. There is no doubt as to the credibility of this story. I know the guy and he is for real. This is the largest animal I have ever heard of being taken with a rimfire. I think the 22 is the most underrated killer in the world.