I don't know about coastal grizzlies but I live with the mountain type. I get these bears around the farm and they track up to the house if we leave dog food out at night. I keep a Browning BLR/ .450 fairly handy as a portable noise maker , yeah it bucks pretty hard...oh well. They like elk calves, chickens and dog food ...in that order....and love rancid carcasses of all flavors.
The .450 is my choice up close, 350 grain Barnes original.