[labette]

The Inuit hunt with .303s even then Polar Bears are extremely dangerous prey

Preferably with said rifle functioning flawlessly.

[beaver fever]

That was the caliber of choice in 1963 when I lived in the north. I don't know what the Inuit use now. But yes Polar Bears are not casual hunting and to kill won elevates the Inuit hunter to legend status especially when they hunted them with spears.