I would prefer an old Ruger SBH before the transfer bar, custom barrel length of 5" (that was the first .44 Magnum I owned) and shoot 300 grain hard cast, gas check bullets. Reason, no broken transfer bar, to date I have replaced 3 transfer bars on different Ruger's. Ruger replaced them no questions asked, but turn around was almost 6 weeks in all cases, I can't hold off a bear with my bare hands that long. But other than that, a Super Redhawk with a 5.5", (Ruger made a few of these, but I haven't looked to see if it is still offered) then a Redhawk with a 5.5". In all cases I would shoot the above mentioned bullets as hard as I could drive them.
The biggest thing you need to know is what feels best in your hand, and how much are you willing to spend to save your life. At bear attack distances, single action probably isn't the best choice, just pulling the trigger is much less time consuming and more natural than single action. This is where barrel length comes into play, 7.5" is tough to swing in brush and you don't need accuracy now, 4" would be better than anything else, but the muzzle jump isn't going to be conducive to a second shot, 5" to 5.5" isn't much help, but the 5.5" can be had with a ported barrel and you will still get that extra 50 to 150 fps of velocity that you loose with the 4".
These are just some of my thoughts. My best suggestion would be a cannon, .454 to .500 S&W, they aren't that much more of anything other than money, then we get back to "what is your life worth".
Ray