Get either a 2x20 or a 4x32...anything higher and you will have trouble locating the target when hunting, because you won't be able to follow it with a handgun set above 4x. You don't want to be using a scope as a pair of binoculars anyways with a loaded gun. Yeah, I know...with a 2x-7x you MIGHT use the 7x settings, but I'll bet you after a couple of times in the field you will keep it at the 2x setting, or get mighty frustrated. You MIGHT shoot at something at a 100 yds away, but for the most part it will be 50 yds or closer, unless you're hunting on the Plains. If you were shooting something in a rifle caliber in a longer Thompson Center, or just for target from a bench, you would have a lot more time to make the shot and might try longer distances. The recoil thing is definitely to be considered, but even with a scope made for recoil. I would still check those scope rings EVERYTIME you clean it. Mine loosen with the 480 Ruger, and I am sure they will with the 454 as well.
RugerCal480 (Mike)