I am an avid backpacker and weight is always a concern, if you are just talking day hikes then not so much.
Since you are adding hunting especially black bears then I would look for a gun that would cleanly take them and make it fit my other needs.
If I was looking for myself then a 4" S&W 629 Mountain gun 44 Magnum would probably be on my short list.
I really like the .357 Mag and have taken many whitetails with it and am sure it would work on black bears, but personally I would want more gun.