I don't think he hunted P. bears, his was doing articles on N. America wildlife and the Polar Bear was covered. He mentioned the .22 Hornet and .222 as a favorite of the people because they could carry lots of ammo. The bears were incidental while hunting seals. It has been probably 50 years since I read this. I never kept much of his writing, but may have the article in a box in the reloading room. If I get to it, I will check it out. If you can still access old Outdoor Life articles you may find it. I am almost 100 % sure that is where I read it. How he knew about I don't remember if he mentioned it.
