A mil is 3.6" at 100 yards or multiplied out 36" at 1000 yards. So it should be 7.2" at 200 and distance between dots should be 3.6".
That being said not all are created equal and the only way to find out is to shoot at the desired distance to check. Seeing as how velocities differ so will drop, also caliber will make a difference, as will bullet weight.
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