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Might as well throw this in as well -

For instance there are artillery sights and compasses with 6,400 NATO mils, 6,000 Warsaw Pact mils or 6,300 Swedish "streck" per turn instead of 360° or 2π...

Ah, yes and no.

1/25.4 = 0.03937

1" = 25.4 mm
1mm = 0.03937and a few zeros and other numbers"

25.4 is an easier number to remember and then you either divide by it or multiple by it to...

You're thinking of 25.4.

1 MOA @ 100yds = 1.047 inches.

Then you've got the issue where some scope turrets are marked in, eg 1 click = 1/4 MOA, whilst others are marked 1 click = 1/4 inch. And obviously there are also 1/8...