Actually, Mils is not "metric", or "imperial"; it is unitless.Man am I glad I unsubscribed early and didn't get drawn in!! MOA = Measurement of America! <-Love it since this is a discussion of SAE vs Metric system which was not intuitive to me and the reason why I asked how people thought when using the mils measurement. USAMU rules! -Out here!
Mils essentially means 1/1000. If the target is 100 yards away (3,600 inches), one mil subtends 3.6 inches. At 200 yards (7,200 inches), one mil subtends 7.2 inches.
If the target is 100 meters away (100,000 millimeters), then 1 mil subtends 100 millimeters.