Vertically split rings can cause problems with scope that need to be dialed a lot. Most of these compress the rube asymmetrically, so with many scope models they can cause problems.
In set and forget applications that is less of an issue.
ILya
Formi has mentioned this as well. And I believe that Vortex doesn't recommend them for their scopes.
I have used Warne vertical split rings a bunch and never had any issues with SWFA scopes. No issues with zero retention or tracking.
