Time for some nitpicking! 😉
I wouldn't say it's a real bug, and it might be caused by something I don't know about yet, but it seems that the mil measurements on the 7x50 M19 Binoculars are two times as big as it should be. You can't zoom with the M19 binocular (it's possible with the M21 but the reticle stays the same size), so there is no way to change the view and get the proper proportions/ratio.
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First I put down 3 soldiers: one at 300 meters, one at 360 meters and one at 500 meters. Arma soldiers have a length of approximately 1,80 m.
The soldier at 300 meters was 12 mil, should be 6 mil.
The soldier at 360 meters was 10 mil, should be 5 mil.
The soldier at 500 meters was about 7 mil, should be 3,6 mil.
At 1000 meters I put two soldiers 10 meters apart from each other, measuring 20 mil between them, should be 10.
At 500 meters I put two soldiers 10 meters apart from each other, measuring 40 mil between them, should be 20.
Also, another (but rather minor) thing: the increments between the mil markings could be more equal. I'd understand if some kind of inaccuracy would be built-in, but I don't expect it to deviate that much.