Converting inch’s to mils

[bluedog69]

bluedog69 ,

Yes sir , I believe that you are correct .

DMP25-06

100yards is 3600". 1 milliradian is 1/1000 of anything at any yardage. So 1/1000 of 3600" is 3.600". Or just 3.6"

3 MOA at 100 yards would be
1.047x 3=3.14"

which is close to 3.6".

3.5 MOA = 1.047x3.5 =3.66"

so 1 milliradian at 100 would be almost identical to 3.5MOA

3.5/60 = about 1/17 Which is bigger than 1/60 of a degree

1/4MOA = 1/240th of a degree
1/10 of a milliradian is .36" at 100 yds

So anyway after chasing my tail here and trying to come up with a clear way to show this. I think the 1/6400 is way off in your post I think it may be closer to 1/17 of a degree.
Actually just trying to figure this out for myself. Not trying to point out mistake.

Can Anyone else explain the 1/6400 thing?
Does what I wrote make any sense?

 

[Hand Skills]

... 2.5 MOA is more or less 10 mils at 100 yards / meters more or less.. It ain't rocket science..

Umm... 10 mils??!

It may not be rocket science, but it's closely related...

SFMongo ,

Actually , 1 Mil-Radian ( mil ) , is 1/6400 of a degree in angular measurement , which equals 3.6" at 100 yards , or 3' at 1000 yards .
So , 1/10 of a mil = 0.36" at 100 yards . It has nothing to do with 10 centimeters at 100 meters .

1 Mil-radian ( mil ) in metric measurement is equal to 1 Meter at 1000 Meters or 39.6" at 1000 meters .

DMP25-06

Actually it kind of does.

I learned about this when a scope manufacturer calibrated the clicks in their scopes to true mRads (6283) instead of the NATO (6400) standard.

The scopes seemed to track improperly, but the truth was, they were tracking properly but just using the wrong scale!

The NATO value simplifies the use of mils - I could go on, but you are interested in learning more just check out this link

http://www.wndsn.com/?d=metrology/MIL_vs_MRAD_vs_NATO-MIL.txt

 

[Hugnot]

At 1000 each click of the clicker on my MRAD 1/10 mil adjust moves impact 3.6 inches.

At 1000 each click of the clicker on my 1/4 MOA adjust scope moves impact 2.6 inches.

 

[DMP25-06]

100yards is 3600". 1 milliradian is 1/1000 of anything at any yardage. So 1/1000 of 3600" is 3.600". Or just 3.6"

3 MOA at 100 yards would be
1.047x 3=3.14"

which is close to 3.6".

3.5 MOA = 1.047x3.5 =3.66"

so 1 milliradian at 100 would be almost identical to 3.5MOA

3.5/60 = about 1/17 Which is bigger than 1/60 of a degree

1/4MOA = 1/240th of a degree
1/10 of a milliradian is .36" at 100 yds

So anyway after chasing my tail here and trying to come up with a clear way to show this. I think the 1/6400 is way off in your post I think it may be closer to 1/17 of a degree.
Actually just trying to figure this out for myself. Not trying to point out mistake.

Can Anyone else explain the 1/6400 thing?
Does what I wrote make any sense?

I chose an incorrect source of information . MY MISTAKE on the 1/6400 of a degree.

I did a search for mil-radian .
I chose "Explained : Mil , Milliradian , and Minute of Angle - Gun Digest" , and it gave an explanation , which was in error . It stated that 1 mil was 1/6400 of a degree which is NOT correct .

In actuality , NATO uses the measurement of 6400 mils in a circle of 360 degrees ., and according to Wikipedia , there are 6283.185 milliradians in a circle .

 

[bluedog69]

I chose an incorrect source of information . MY MISTAKE on the 1/6400 of a degree.

I did a search for mil-radian .
I chose "Explained : Mil , Milliradian , and Minute of Angle - Gun Digest" , and it gave an explanation , which was in error . It stated that 1 mil was 1/6400 of a degree which is NOT correct .

In actuality , NATO uses the measurement of 6400 mils in a circle of 360 degrees ., and according to Wikipedia , there are 6283.185 milliradians in a circle .

What I think the metric mils actually are is a system where they said ok at 1000 meters we will make a milliradian 1/1000 of that. Then they went back to the circle and calculated how big a radian needed to be.

Would be like if they said exactly 1" at 100 is 1 MOA and then went back and figured out how big a degree needed to be to get 1/60 of it to be exactly 1" at 100.

Just like they decided that a box that measures 1 cm x 1 cm x 1 cm would equal 1 milliliter. That way a length measurement corresponded to a volume measurement.

So the 1/6400 is 1/6400 of a circle and not 1/6400 of a degree.

60x360=21600 minutes in a circle? So maybe milliradians???? Heck if I know. LOL

Gonna have to do me some research.

 

[Hand Skills]

What I think the metric mils actually are is a system where they said ok at 1000 meters we will make a milliradian 1/1000 of that. Then they went back to the circle and calculated how big a radian needed to be.

Would be like if they said exactly 1" at 100 is 1 MOA and then went back and figured out how big a degree needed to be to get 1/60 of it to be exactly 1" at 100.

Just like they decided that a box that measures 1 cm x 1 cm x 1 cm would equal 1 milliliter. That way a length measurement corresponded to a volume measurement.

So the 1/6400 is 1/6400 of a circle and not 1/6400 of a degree.

60x360=21600 minutes in a circle? So maybe milliradians???? Heck if I know. LOL

Gonna have to do me some research.

See post #58

Wndsn Applied Science

Wndsn's Applied Science Lab, based in Berlin, develops and manufactures that which can't be improvised; measurement, navigation, and surveying instruments informed by the motto 'Ex Mensura, Scientia' - knowledge from measurement. Wndsn produces archival quality products that are designed with...

www.wndsn.com

 

[Hugnot]

My biggest artillery item is a 6.5-06. .375-.338.

I hope this helps:

From Wikipedia.

 

[bluedog69]

See post #58

Wndsn Applied Science

Wndsn's Applied Science Lab, based in Berlin, develops and manufactures that which can't be improvised; measurement, navigation, and surveying instruments informed by the motto 'Ex Mensura, Scientia' - knowledge from measurement. Wndsn produces archival quality products that are designed with...

www.wndsn.com

My biggest artillery item is a 6.5-06.

I hope this helps:

View attachment 293754
From Wikipedia.

Here is a very basic version. I like how they have the video where they take the radius and then wrap it on the arc of the cricle. Great for high school kids.

circumference = Pi x D which also = Pi x 2R so rearrange that into 2 Pi R so 1 radius = 1 radian so that is why it is 2 Pi around the circle

https://www.mathsisfun.com/geometry/radians.html

 

[Hondo64d]

Ok I have a mil scope but if I am shooting at a distance of 63 yds and measure that I am 2 3/4" too low how do I convert the 2 3/4 " to mils to make this adjustment?

I am looking for a formula.
I know at 100yds 1 mil = 3.6 " so 50 yds 1 mil =1.8"

But for oddball distances if I know how many inches = then how to I covert to Mils and make the correct scope adjustment without wasting ammunition?

thanks,

mike

If you have a mil based reticle with mil adjustments, you don't convert anything. With your reticle, you measure how far you missed your POA and make the adjustment as appropriate. No need to convert anything.

The only reason you would need to convert would be if your reticle's scale and scope's adjustment don't match, which wasn't uncommon not so many years ago.

Edited 'cause in hindsight I thought I should also answer your question.

At 100 yards, 1 mil is 3.6" so at 63 yards, 1 mil = 3.6 x .63 = 2.268 inches. 2.75 inches in mils would be 2.75/2.268 = 1.2 mils.

John