OK, I thought I had this all straight but then I started reading and figuring and one thing lead to another and now I don't know what I know. I tested an optic by turning it up 120 clicks which puts me at 30 whole numbers of some value I'm trying to determine, the optic moved 31.5 inches so I took and divided actual movement of 31.5 inches by dialed movement of 30 and it came out at 1.05 which I'm thinking is what my actual turret movement is in since it was done at 300ft and MOA should be 1.047 at that distance. So I'm thinking that's .003 over correcting at 300ft for MOA and so the correction factor would be 1 minus .003 which is .997, but then I read the directions and they seem to have you dividing dialed value by actual value and that is your correction factor which comes out as .952 so I think that's it but it does not look right! JacknSD put it like this in another thread trying to help but my brain ain't gettn it so I though I best move to another thread!! Maybe I need the why you did it the way you did written out? Thanks for helping!! "If you meant 30 MOA moved it 31.5 inches at 100 yards then it would be: .997 30*1.0471996=31.415988 31.415988/31.5= .997 So almost no correction seems to be needed. "