Unless you are talking about the biggest Brownies in Alaska, the .454 should be fine medicine. Depending on where you live, even the 44 mag is pretty stout medicine. I've taken a large black bear with the .44 and it worked well.
For the biggest bears, even the largest handgun calibers are probably inadequate.
By the way, the Ruger is the super Redhawk Alaskan. Personally I don't think any handgun should be the primary weapon against bears.
As far as the S&W survival pack is concerned, I am currently building a similar kit for my self using a Ruger Redhawk in 44 mag, and similar articles as the S&W kit. I don't figure I am going to meet any large bears so my kit will fit my situation for smaller critters, both two and four legged. I'm going to concentrate on the gun, ammo, matches, a good knife and a couple of other survival items like water purification straws and tablets and perhaps space blankets, etc. With all the stuff I'd like to put in one case, I may not be able to carry it, so it is a work in progress.