The Taurus Tracker is an extremely interesting little backpacking piece to me but not the current 45 Colt model.
I've been looking at these for some time. The very fact that it has a cylinder long enough for 2 1/2" 410 shells is what puts me off this model. Too long a jump to the forcing cone to expect much in the way of accuracy. Pity, as I specifically wanted this in 45 Colt. I would not have loaded it as hot as my Rugers, but relatively warm hard cast bullets from 45 Colt always get the job done in my experience.
The Tracker in 44 magnum may soon be a replacement for my wife's Target Bulldog in 44 Special (her backpacking choice) or... I hate to add another caliber, but the one that makes the most sense of all is the 41 Magnum Tracker. I've been leaning a little more that direction the last month. The size, weight, form, and caliber really come together in the 41 mag Tracker.
As for snakes - I don't carry shotshells; my wife very rarely carries her Bulldog with Speer shot capsules I loaded - usually they are in a speed loader. Just "comfort ammo" for her, as she does not practice as much as I do. The only snake we have EVER had to shoot was a poor black snake I accidentally ran over with my mountain bike, and I euthanized it with one shot from the Ruger MkII (22 lr) I had on me at the time. We ate the snake that night.
OTOH, I shot truckloads of small game (mostly ptarmigan) for the pot with my favorite Ruger Blackhawk in 45 Colt (very heavy bullets; very heavy handloads). It is pretty easy if you are using an accurate load and are practiced with it. I demonstrated this for my sons a couple of weeks ago while at the range - starling at 50 ft, one shot, decapitated (no idea why it landed on my close range target backer). It's more difficult as the caliber goes down - difficult shot for me with an iron sighted 22 pistol (the head, I mean).
IMHO, shotshells in a pistol are a waste of effort.
HTH,
Tom