Thread: Mil-Dot reticle help pls clever fellas

Originally Posted by Cordite

Mil dot range finding.
…..................................

A full circle of 360degrees is 6283milliradians, or mils.

1mil @ 100m = 10cm
1mil @ 200m = 20cm
1mil @ 300m = 30cm
1mil @ 400m = 40cm
.
.
1mil @ 1000m = 100cm
1mil @ 1800m = 180cm

Quick calc, memorise this:

Height in cm / measured height in mils = distance in metres.

With the above you can determine at which precise setting your mil dot reticle actially measures mils.

And boys, lets forget about yards and inches.

I think the problem is he doesn't actually have the scope to test it out on a target to confirm those measurements on the reticule the easy way. Hence the nasa/particle physics level mathematics equations.

Originally Posted by Ftx325

I think the problem is he doesn't actually have the scope to test it out on a target to confirm those measurements on the reticule the easy way. Hence the nasa/particle physics level mathematics equations.

Yep. I just reckon Flyblown will trust his own measurements more than some factory blurb. So when he gets his scope he will just put a 10cm high or wide target up at 100m and zoom his scope till it coincides with one dot centre to dot centre measurement.

In the end, even if the factory leaflet is accurate, will the graduations printed on the scope zoom ring be correct? Literally only one way to know.

And forget MOA too.

I had a clear Ridge mil dot 2nd focal plane, the 10x on the zoom ring was red which was
clever idea and a bit of a give away for the correct magnification.

Greetings All,
Probably a good time to remind everyone that a mil and a milliradian (mrad) are two different units. Our American cousins routinely get the two scrambled. A mrad works out to 10 cm at 100 metres exactly and a mil is 9.8cm. Smaller than the difference between 1MoA and 1 inch at 100 yards yes but different just the same.
Regards Grandpamac.

Just to confuse..

Definitions of the angular mil

There are 2000π milliradians (≈ 6283.185 mrad) in a circle; thus a milliradian is just under 1⁄6283 of a circle, or ≈ 3.438 minutes of arc. Each of the definitions of the angular mil are similar to that value but are easier to divide into many parts.

1⁄6400 of a circle in NATO countries.
1⁄6283 The “real” trigonometric unit of angular measurement of a circle in use by telescopic sight manufacturers using (stadiametric) rangefinding in reticles.
1⁄6000 of a circle in the former Soviet Union and Finland (Finland phasing out the standard in favour of the NATO standard).
1⁄6300 of a circle in Sweden. The Swedish term for this is streck, literally "line". Sweden (and Finland) have not been part of NATO nor the Warsaw Pact. Note however that Sweden has changed its map grid systems and angular measurement to those used by NATO, so the "streck" measurement is obsolete.

Thanks Zimmer,
I believe that the US armed forces used two different versions at the same time between the wars.
Regards Grandpamac.

I realise just how thick I was being yesterday, not just with the primary level maths but also how to use Strelok to solve this problem easily. I blame it on the meds... and the kids... and the dogs... Using the values provided by the scope manufacturer I can clearly see how a 10 times calibration produces the 15x and 2.5x MOA values.

I’ve also been able to work out that this reticle is based on the US Army version of the mildot, not the US Marine Corps. Doesn’t make any practical difference to the holds in the field though.