Get a short (19") bbl .243 - or better yet 6mm and you won't have to lug so much weight around. It will kill a bear dead. That's all a .50 cal can do - to the bear.
If you want more guns in a variety of calibers - use the '48 hour rule'. It was invented in MN and works great.
You buy something your wife may not approve of. If you can get it in tothe house and keep it there for 48 hours, you're allowed to say: "That old thing? I've had that forever".
It's not considered cheating or lying. You have told the truth and don't have to feel guilty about the purchase.