Bear Country Carry. The Ruger Super Redhawk Alaskan. A lot of reviews on line. Here's one.
What I carry is an S&W M642. It weighs 15 oz. empty. The Ruger weighs 42 oz. empty. Mine is a .38 caliber. The Ruger has a choice of much larger calibers, .454 Casull, .45 Colt, and .480 Ruger.
But my recollection is that guns are banned in most state and national parks. It would upset the wildlife. Oh, well.