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Old February 14, 2013, 07:03 PM   #1
VegaSSG32
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Join Date: January 19, 2013
Posts: 46
Scope adjustment in MRAD

Can anyone tell me how the conversion is with a scope that adjusts in MRADs to MILs,

Im looking at the Vortex PST 6-24x50 EBR-1 MRAD
http://www.vortexoptics.com/product/...eticle/reticle

I dont understand the MRAD Adjustment Graduation .1
Travel per Rotation 5 MRAD
Max Elevation and Windage 19MRAD

Im a Newbie and would like if someone could put this in words i can understand...

Im used to the MIL-Dot with 1/4 MOA Adjustments

Hope this isnt a stupid question

any input would be appreciated... Thanks
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Old February 15, 2013, 09:33 PM   #2
gk1
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Join Date: May 31, 2002
Posts: 101
Both mil and mrad are abbreviations for milliradian. Does that clear things up?
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Old February 15, 2013, 10:05 PM   #3
FtrPilot
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Join Date: September 4, 2010
Location: Woodstock, GA
Posts: 88
No such thing as a stupid question

I am shocked that all of the engineers and mathematicians have gone to bed early tonight and have not answered your question. Having spent over 20 years in the US Air Force dropping bombs using a sight calibrated in milliradians (Mils), I will try to answer your question as best I can. My assumption is that MRAD stands for milliradians.

In Fighter Pilot 101, I learned a long time ago that a radian is approximately equal to 57.2958 degrees. I thought who cares, what does that mean to me, what time does the bar open?

The basic Fighter Pilot ROT (rule of thumb) is that one milliradian equals 1 inch at 1000 inches. I am sure that some German mathematician would correct me and state that 1 milliradian equals 1 meter at 1000 meters.

So, assuming my ROT is correct, that 1 mil = 1 inch at 1000 inches, then 1 MRAD adjustment would be 1 inch at 27.28 yards. Therefore, .1 MRAD adjustment would equal .1 inches at 27.28yards, or .36 inches at 100 yards.

Since 1 MOA equals 1 inch at 100 yards, 1/4 MOA adjustment (or .25 inches) would be a smaller (and better) increment than .1 MRAD (or .36 inches ).

Am I making sense? If so, please notify my wife. She says I have not made sense in over 25 years.

V/r,
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Old February 18, 2013, 06:29 PM   #4
mikikanazawa
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Join Date: September 26, 2004
Posts: 449
There's more than one definition to "mil."

For riflescopes sold in the U.S. a "mil" is approximately 1/6283 of a circle.

http://en.wikipedia.org/wiki/Angular...he_angular_mil

So, one click of a 1/10-click scope changes POI by about .36 inch.

In some military instances, a mil is 1⁄6000, 1⁄6300 or 1⁄6400 of a circle (depending whose military).
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