Slide mounted RDS are common in NRA bullseye shooting - particularly in the US. Ultradot scopes are preferred as they seem to handle the G-forces more effectively. Loads need to be increased about half a grain to function. Using them on guns that shoot full power loads would seem to be risky to me. I would expect failure of the scope or the mount. That being said, as a bullseye shooter, all of my match guns wear frame mounted scopes in old Weigand unitary mounts.
Dr Jim