I suggest reading the May 2005 American Hunter magazine (NRA) on this topic. I've never been up close to a Grizzly and hope never to. However, after hunting Elk several late seasons in NW WY in the middle of Grizzly and Mtn. Lion country I wouldn't go into use area with out both magnum caliber and bear spray. (Or the 12 guage with 00 and slugs sound effective shorter range.)

I used a .300 Win Mag with Win Prem. 180 gr Fail Safe ammunition for Elk on those trips. I'd hope that it would stop a big bear, as it put down Elk in short order. However, I really wouldn't go looking to find out.

The spray wouldn't have done any good the last trip on top of a clear mountain side with winds gusting 30-35 mi/hr and snow. In such case, it would be just as likely the spray would come back into your own face or away from the bear you're trying to keep away.

I would always pray before going out to avoid such a situation, but if it did happen to have God's grace and courage to do what needed to be done. That's all I can say I'd do.

If I thought a large cal. firearm or ammunition would be more effective than a .06 or other, I wouldn't hesitate to find a way to buy them. How much is your life worth to you and those who know you?