i think there's 2 versions, one with less drop
30 moa would be 120 clicks, so without any shim or angle, it would coincide with the pellet 120 clicks away...depends how your scope is set up...but if your scope is 120 clicks away from being on zero at 55 then thats where it will be with rail so to speak
obviously, if your using adjustable mounts to start with then your simulating the rail anyway.