reddeer:
I use Weaver 4 X 4's extension rings on all my Encores and Contenders. The Encores are all rifles 209 X 50, 7-08, 300 win mag, 7mm rem mag. All barrels have Leupold 6 X 42 scopes mounted as far forward as possible (to avoid scope bite and easy hammer access). Contenders are all pistols, 357 mag, 357 Max, 30 30, 7-30 Waters, 44 mag, and 45 X 209. The extension puts the scopes farther out over the barrel and reduces barrel climb. The rings have never failed me and I have a bench full of other makes that for some reason or the other I did not like.
I really doubt that you will have any trouble with the rings.