Curious and Curiouser,
Assuming that the 1 cm at 100 metres is correct then the number 1 corresponds to 40 mm or a little over 1.5 inches at 100 metres. I think that the only way to be sure is to do a box test by mounting the scope on a rifle and seeing how far 10 or 20 clicks takes you at 100 metres. You could also dial on 2 whatever they ares to see what that comes too as well. All else should become clear at this point. 1 mrad (10 clicks?) is exactly 100 mm at 100 metres. The Military needed a round number for their artillery and adopted 6,400 mils to a full circle versus 6,283 mrad to a full circle. 0.1 mrad (or 1 cm at 100 metres) equals 0.36 inches at 100 yards and 0.394 inches at 100 metres. Leupold scopes are calibrated in mrad and so marked. I am sure the manufacturers had a clear plan of what they were trying to achieve when the scope was made, you just need to nut out what is was.
Regards Grandpamac.
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