I just bought a 700 BDL 30-06 and bought some Leupold Rifleman rings and Millet bases. I wanted detachable rings in case the scope failed but most of them have levers or knobs that stick out far and look like they would snag on something. I can detach the Rifleman rings just as fast as long as I don't forget to take the little Allen wrench along. You generally want the scope mounted as low as possible for quick targeting and to keep the rifle well balanced. The front objective bell determines the ring height and in general you use low rings up to 34 m/m, med rings up to 40 m/m, and high rings over 40m/m.