The Taurus Tracker .44 mag is an excellent choice,
i have a Taurus Tracker 44 with the ported 4" barrel, blued finish. great pistol, and pretty decently accurate.
the only change to mine was to put a Hogue MonoGrip on it. made a world of difference as i didn't care for the factory grips at all.
I have the Taurus M-44 6" and love it.
Gello's prolly right that the 12ga is the best choice but you will prolly be ok with the Taurus on a chest rig.
Also don't listen to Gello when it comes to bears. He's slightly batsh*t insane. (Nothing but love for ya, Gello )
Always have clean socks.