LJBass: Just yesterday I fished the Bighole River here in SW Montana and my fishing partner carried (waded right out into the river with it!) a stainless Smith & Wesson Model 629 in 44 Magnum with 8 3/8" barrel!
He carried it in a cross draw holster.
There have been several Grizzly maulings/attacks here in SW Montana in the last month. Along with numerous encounters/sightings.
I carried a Leatherman Super-Tool!
I would recommend a "fishing box" pistol of the Glock Model 43 style.
Best of luck to you with whichever you choose.
Hold into the wind
VarmintGuy