Can't speak to base, my 460 didn't need one. Spoke to the guys at Warne, who are neighbors to Leupold, before I mounted. They did X Frame testing with a bunch of different scopes. Based on what they said, I wound up returning the scope I bought and got the exact same scope you have and used 3 Warne rings to mount. They said whatever I used I would probably have to rezero the scope after 60 or so rounds. I have far more than 60 rounds through the gun, scope is still right on the money, and very happy with the setup.