Will a .410 slug have any effect on a bear? I know it will drop a deer, but I wonder if anything short of a head shot would really matter to a thing as big as a bear? How about a 30-30?

I know someone who killed a charging girizzly with a .243, but he was a great shot, and made a head shot that time.

Enquiring minds want to know what to pack for a long hike in the deep wilderness.