I love my GP100 4" and it is what I take while Backpacking. I put it in a crossdraw and it works perfect. I am not concerned about weight.

MM is a lightweight backpacker and I think the GP100 maybe a little much. Again I strongly recommend the Ruger SP101 smaller and lighter than the full size but still very manageable.

Most people are recommending a semi but remember that those extra 9rounds add weight to your carry.

MM you said you will be deep enough away from two legged predators. I don't think you will be going against a pack of gang-bangers and in need of a hi-cap. I have also found when in the woods people look at you differently if you are carrying a revolver vs an auto.

For something that is foolproof go with a revolver and some speedstrips. Plus the .357 is a proven stopper be it four or two legs.