as grandpamac explains there are several variants close to the mRad so check that your scope is actually millRad ie 1cm per 100m.
There is a similar problem with Imperial systems, that 1 MOA is not exactly 1 inch per 100 yd and the discrepancy is more than for cm/100m .
The third point to check is whether your rifle range is 100m or 100 yd - it could be either or often “more or less” so you specially need a range finder if testing the click value testing of your scope or doing “tall target” exercises.
Fourthly, if using or testing mildots and moa hashes on your reticle you need to check the units claimed by the manufacturer and test them on a known sized mark at a range findered distance. Personally, I find graduated reticles a waste of space unless the scope is first focal plane but that’s another argument …
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