I can't comment about the Tracker, never handled one and don't know if they're rated for +P.

I have handled quite a few other wheel guns, and if you're really going to go after bear EVERY YEAR, I'd recommend a Ruger Super Redhawk in .454Cassul. I'm a huge Ruger revolver fan, a die hard single action shooter, and love the .44mag more than my dog, it's hard to beat the Ruger Super Blackhawk or Super Blackhawk hunter .44mags, great deer hunting rigs, but since you're in Montana, where you might happen to hunt bigger things like Elk, moose, or heavy bruins/brownies, and might have to fend off a mt. lion-do yall have wolves up there?-I'd recommend the .454cassul Super Redhawk in 5.5 or 7.5", I've had three SRH's now, two .454's and one .480....

It's DA so it'd be fast enough and simple enough for defending yourself with (best done with .45colt loads), and the 7.5" bbl is plenty long enough to offer superb hunting accuracy.

I recommend the .454cassul over the .480Ruger, even though I like the .480 more because you get three pistols in one, I've got enough I don't have to worry about that, but with a .454 SRH you get a plinker with cheap .45colt ammo, a deer hunter with stout .45colt ammo, or a powerhouse kill-anything-er with the .454cassul...the .480Ruger costs the same and kicks the same whether you're shooting for fun or to put down a buffalo.

If you're only going to hunt a few bear with it occasionally, maybe to back up your rifle and will mostly only be hunting deer with it, then I'd get a Ruger Super Blackhawk Hunter in 7.5" bbl, I've got two SBH's and one SBH hunter, all in 7.5" awesome shooters I'd take a 100yrd shot on a deer and feel confident with them. If you're mostly going to stick to lighter stuff, but occasionally step up to the heavy bears, then a .44mag or .45colt in a Ruger would be a great choice, if you're going to be hunting bears as often as you hunt deer with it, I'd be looking at a Ruger Superblackhawk in .454C.