What type of shotgun would be best for protection from grizzly bears?

A friend recommended I purchase a Mossberg 6 shot retractable stock 12-GA pump shotgun (18.5" barrel) for protection against bears on my wilderness trip to Canada this summer. He said it would be easy to pack and handle, and provide ample power in case I find myself facing an aggressive grizzly or brown... show more A friend recommended I purchase a Mossberg 6 shot retractable stock 12-GA pump shotgun (18.5" barrel) for protection against bears on my wilderness trip to Canada this summer. He said it would be easy to pack and handle, and provide ample power in case I find myself facing an aggressive grizzly or brown bear.

Any input or other suggestions? Leads on where to get a good deal?
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