I used the Talley makes on an older AV Sako awhile back, but it was a lot of money. I see, but do not understand clearly how they work, the Leupold "ringmount". I can only "assume" they clamp onto the tiny grooves on the action ( ala .22 mounts) and that "Medium" would put a 40MM were it needs to be. ( the Medium Talleys were too high on the AV/tally bases, had to use Low) Has anyone used or read how these do. Rifle is a .243 so low recoil and I don't handle my rifles rough, actually I baby them!