I've always heard that being able to shoot 220 grain bullets for bears was one of the virtues of the 30-06. So I don't know why you'd want to go lighter with the 300WM.
Maybe with the advancement in bullets the heavier slug is not necessary anymore. But extra SD and penetration couldn't be a bad thing when trying to get past thick heavy wet fur and giant sturdy bones to the heart of the beast.
Of course a CNS shot would be optimum. That's the only sure-fire method to disable him.

Also, I'd definitely choose a small fast handling scope with a low power setting for a wide field of view and some kind of heavy reticle for fast sight acquisition just in case the bear got closer than you were anticipating.

Last edited by DollarShort; 02/23/20.