I've been in grizly country, but I'm from East Texas. Grizzly's and big wild hogs attack the same. They will mow you over first, then turn back to finish the job. If you use bear spray, that bear is still going to mow you over with speed and momentum. Your gambling on whether or not you got enough spray in it's face to convince it not to come back and finish you off. And, if the wind isn't at your back, forget the bear spray. In every case, bear spray isn't nearly as effective as a magnum gun.
Always go camping with a slow friend...................