The key to any external adjust scope mount is a three point support system.
Some use a grasshopper spring below and two small buttons above. Others a spring loaded rib above and buttons below.
Rear mounts use some variation of the three point support with one point spring loaded.
This allows constant support as the apparent shape of the scope tube changes from round to ellipse as the scope is adjusted.
Chuck

Chuckster wrote on Aug 20^th, 2023 at 12:21pm:


I have a number of rear mounts with 4 point systems. I always thought a 4 point was a better setup with two spring loaded plungers so one opposite each elevation and windage adjustment.

I have a pretty rare Belding and Mull scope and rings that adjust elevation and windage on both front and rear rings! It allows far more adjustment than any rear only style rings do.

Well they worked... I finally got to the range to shoot my 74 Sharps I have been working on and was pleasantly surprised at both the gun and the scope. My mounts worked great. Very little adjustment to get it dialed in. With a 300 gr bullet and 22 gr of 4198 it got me 1260 fps and a 1 1/2 inch group at 100 yards. The scope moves about 3/4 of an inch travel. The index notch brings it right back to position for the next shot. I have some more load development to do but again everything worked as intended. One day when I figure out how to post a picture I will post some photos.


JMH