Dave, its precisely 2 MOA per grad. Everysight has an MOA per grad. Its nice when its a whole number like 2, makes it easy for adjustment. Its a very simple thing once you know what the drop/grad ratio is. The easiest way to find it is to shoot the rifle. I like 25 yards because one can do a considerable change in MOA and still be on target and the sighting MOA is small. First pick a Major Grad low on the ramp, shoot a 3 shot group, Next take a large step up in grads, I did nine when doing the Apex. The larger the step up the more the change in ramp position will swamp sighting error. Just divide the inches separating the centers of the upper and lower groupby the number of grads adjusted.Multiply that by 4 to get inches per grad at 100 yards. This number is roughly the MOA per grad.

Then its just a matterknowing the trajectory. In my case, if I am4" lower than I want to be at 100 yards, just adjust 2 grads. This because the drop from the boreline is the same no matterwhere the boreline is pointed.So need to lift the POI of 4" at100 yards" just lift the borelineso that it intersects100 yards4 inches higher. It's handy stuff.