I have usually carried Ruger 44 mag as a back-up weapon, but have recently switched to a Glock 10mm. I have never had a Glock fail, the Glock is quick to shot, has 16 rounds of 200 gr Beartooth rounds from DoubleTap ammo and another 15 rounds in a second mag.
I carry the Glock as an overall mountain gun (cougars, bears, 2 leg pest). Glock funtion and I know that if I were spending a longer than anticipated stay in the mountains, that I have enough ammo to easly hunt for a long while.
Eric