I agree with Zeus, pretty much the whole way on this one.
I have a 2X Leupold mounted w/a SSK T'SOB mount & 3 rings, on my FA 454. This set up has worked well for me on wild boar, deer, & moose - from 25 to 110 yards! In my opinion, most variables are to big to put on a revolver (looks, weight, & bulk). I like the size and weight of a good 2X, or maybe 4X, depending on what and where you'll be hunting. And the recoil from the .454 has ruined a lot of scopes, so keep it simple and tough. Don't get me wrong, I really like the 2.5X8 Leupold (I have one on a Contender barrel), I just wouldn't put one on a .454!
Hope this helps, have a good day!
Del