The picture in the first post is not a Ringmount. It is a 2 piece Optilock. In the 2 piece a 50mm will fit in the low mount.
The ringmount by Optilock only comes in low and will not accommodate a 50mm on any of my rifles.
Leupold and Millett also make one piece ringmounts for the Sako.
Actually the definition of a ringmount is a one piece mount.
The picture i posted actually show both of Sako mounts, top is Ring Mount and bottom is 2Pieces Optilock.
So I see. There is only a picture of the two piece Optilocks. The ringmount dimensions are mentioned in print.
I couldn't mount a 50mm with the Ringmounts,nor could I mount a 40mm Leupold 4-12 VX2 with AO. The AO ring made the objective large enough that it wouldn't fit on my Sako rifles.
The 2 piece low Optilock will work with a 50mm easily. I don't know if it will work with anything larger as I don't own any scopes larger than 50mm.