S&K mounts are the best, period, end of story. They have windage adjustments in both bases and all the other advantages of Control EXCEPT the rings are one piece. Expensive? yes, but when you can put a 4-16x50 Schmidt PH on an 8 pound 375 and zero it for windage with the erector dead center, shoot 100s of rounds through it and NOTHING moves ..... well you get what you pay for.
My latest S&K :http://www.scopemounts.com/index.html?main.html
project. A Benelli R-1 in 270 WSM w/a 2.5-10 NF on it. (R-1 uses same bases as a BAR).
Shoots quite well: