Was going to say I think we've discussed this before.
Best bet would use it to scare. Otherwise you'll probably just piss it off. Maybe go Butters on it and shoot it in the dick. If you're getting mauled maybe jam it in the eye or mouth before pulling the trigger. Maybe spray yourself with pepper spray, this way at least you know you'll get some revenge when you come out the other end.
Ok, so Grizzly Bear with a 9mm or gorilla with a rifle in riot gear? You know the bear is gonna turn it sideways, but the gorilla might go James May and point the gun in its own face.