probably beaten to death... but... offensive weapons vrs defensive weapons... you are not hunting here, you are defending your life...
sure it would be great to get the extra velocity of the longer barrel... but if the tent is crashing down around you, the shortest most powerfull, highest capacity ( double action ) you can get is going to most effective... that 12" barreled ( exagerated for effect ) 44 mag / 454 Casull has much better killing power than a 40 S&W Glock, but if the barrel is too long to get pointed in the right direction, the gun is nothng more than a club, or worse yet, likely to get shot towards another person trying to figure out how to help you...
you may feel that single action revolver is quite a natural fit in your hand ( I do ), however, in extreme pain of broken bones & ripped flesh of a bear attack, it is feasable that you could "forget" to cock the gun before trying to pull the trigger ( I watched a show on bear attacks, & in this one story, a woman was attacked in her tent, & had a revolver, but was unable to fire it... the gun they showed may have just be a representation, but they showed a 6" barreled 44 Mag Blackhawk single action revolver )
... many years ago, I built a full sized Dan Wesson 44 Mag into a snubbie with a barrel nut compensator... & I reciently bought a stainless Ruger Alaskan in 454 Casull both have between 2" & 2.5" barrels OAL ( the Dan Wesson was blued, & I wanted a stainless gun ) for me a full 6 shots of magnum big bore out of a snubbie is enough... but don't think that 15 rounds of 10mm out of my Witness, wouldn't be reassuring if I didn't have one of my snubbies...
... for "in your tent" self defense, I'd rather have that high cap .40, than that 6" barreled 357...