Mountain10mm: My idea of the "perfect packin pistol" has recently changed!
For decades I have "packed" one of my 22 L.R. calibered Smith & Wesson Model 34's, Model 63's or my Model 651 (22 Magnum stainless revolver J-frame).
Sadly with the number of large predators (including Black Bear, Cougars, Wolves and Grizz!) being allowed to increase dramatically, by the next to worthless Montana game department, and the huge increase in Grizzlies in my immediate area, I now choose/advise a Smith & Wesson Model 629 with the perkiest 44 Magnum loads available - in what ever barrel length you prefer - mine is 6".
Oh yeah, and as a last resort, "Bear Spray" should be packed as well.
Hold into the wind
VarmintGuy