I'd take my Mossberg 500 and Brenneke Black Magic 3" Magnum slugs
. As someone who hiked a lot in Grizzlie country in Alaska, I'll use what the Alaska State Troopers use for their bear guns (though they are issued 870's). For a handgun, .44 Magnum with the biggest, baddest rounds I can find. Though when I was hiking, I usually only had my shotgun slung over my shoulder.