The FA 45 Colt you have is an excellent hunting revolver for just about anything. If you simply want another one, then you can't go wrong with one in 475 Linebaugh. Mine is a 7 1/2" with a Leupold 2x in an SSK mount. This is, hands down, the strongest mount for a hunting handgun. 2x is all you need on a revolver. Mine will put 5 bullets in two inches at 100 yards all day long. It's a hammer. You can load it light with 325gr bullets for smaller game, or 425gr for big stuff. Cast bullets are the way to go, you already have a 475 inch hole.

I have two FAs, the 475, and a 6" 454 Casull with iron sights. Superb hunting guns.