Never seen a wild grizzly, nor have been anywhere that they live, to my knowledge. I don't know what I'd do, but I have a bad habit of shooting my SRH in single action mode.... I suspect I'd carry it with me with heavy boolits, and carry my 870 Express. But here in Alabama a bear of any kind needs to be chewing on your foot before you can shoot one, and even then you'll probably be in serious trouble with the fish and game department.