I think I read somewhere that Polar Bears evolved from Brown Bears.
Polar Bears are classifyed as Marine Mammles, as they only go to land to rest in summer and den up for cubbing. Male Polar Bears do not den up
When specificly going after Bears, lotsa guys around here use .243w, 30-06, .22-250 ect, as they are also popular Caribou and Seal rifles as well.
Plenty do use a .223.
Some guys use ONLY a .223 because they own only one rifle.
They use what they have and what they know well enough to do neck shots on basking Seals, Walrus and Polar Bears. Flat shooting rifles at white on white is a nessesity, as noted, because its very hard to judge range on.
A 17 year old kid shot a Polar Bear here at Noorvik Ak a couple years back with one shot from a .243w, no problemo.
My fatherinlaw, Joe, who was born 1903 hunted Polar Bears as a teen with a 25-35, and only aimed at the Temple between the eye and the ear or base of the skull if it were moving away, and always at close range. He trapped Arctic Fox and hunted Polar Bears in the 20's with his uncle, on the North Slope and mouth of Coville River in Northern Alaska, when he could get 75$ for a fox and 300$ for a Polar Bear, untill the Depression came.
Later in life, he moved up to a 30-06 when the Alaska Territorial Guard Eskimo Scouts gave him a 1917 Enfeild and let him keep it after the war ended, and used that for years.
Fact is, that old man though the .243w was the best of 'em all........
Shot placement IS everything
~~LOL!!~~