Rifle Scopes Milrads and MOA?

[IdahoMike]

I have my .223 zeroed at 100yds, when I shoot at 400yds I can adjust my elevation 7 MOA or adjust 2.5 Mil (Kentucky Windage). my scope is not FFP, and is set at the appropriate mag. to measure in mils effectively (according to Leupold). My question is what if anything is the relationship between Mils and MOA? Is there a ratio of X # or MOA to X # of Mils one way or the other?

Thanks.

IM

 

[Captain Kirk]

Re: Milrads and MOA?

Mil/MOA equations

get ready for a mind melt

 

[Nachtadler]

Re: Milrads and MOA?

One mil equals 3.6 shooter's MOA (aka IPHY). Conversely, one MOA equals .278 mils. That's the relationship.

Captain Kirk, thanks for the link. I can use that, too.

 

[Chiller]

Re: Milrads and MOA?

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: IdahoMike</div><div class="ubbcode-body">I have my .223 zeroed at 100yds, when I shoot at 400yds I can adjust my elevation 7 MOA or adjust 2.5 Mil (Kentucky Windage). my scope is not FFP, and is set at the appropriate mag. to measure in mils effectively (according to Leupold). My question is what if anything is the relationship between Mils and MOA? Is there a ratio of X # or MOA to X # of Mils one way or the other?

Thanks.

IM </div></div>

Make sure you are on the right power setting or you will be SOL in that you are SFP.

 

[sobrbiker883]

Re: Milrads and MOA?

1 mil=3.438 moa

 

[IdahoMike]

Re: Milrads and MOA?

thanks for clearing that up folks.

 

[sniperaviator]

Re: Milrads and MOA?

The reason they are different is there are at least 4 different values as to exactly what an MOA is. 1", 1.02" 1.047" and another one I forget right now (in 100 yards). But Schmidt and Bender and Nightforce claim to use 1.047, (which is the most mathmatically correct IMHO). (I am pretty sure they have both stated that, correct me if I am wrong)

If you take 1MOA equal to 1" at 100 yards you get a different relationship to a mil than if you take 1.047".

Everyone agrees that a mil is 1 in a 1000. So at least IT if well defined. (Yes its a milliradian, but that means 1 in a 1000 when you use the ratios)

Most people use 1 moa equals 1" at 100 yards, which is 1 in 3600. Then if you want to adjust it, multiply your final answer by 1.047.

The reason there are 4 different values to an MOA has to do with an assumption as to exactly how to measure the "cap" on the angle triangle at 100 yards. Do you measure along the circumference of the circle? a chord in front of the arc of the circle? a chord in back of the arc of the circle? or a right triangle off on of the angle radii? As usual it gets COMPLICATED and people seemed to have done it differently for years.

 

[Lindy]

Re: Milrads and MOA?

<div class="ubbcode-block"><div class="ubbcode-header">Quote:</div><div class="ubbcode-body">The reason they are different is there are at least 4 different values as to exactly what an MOA is.</div></div>

I'm afraid that turns out not to be the case.

A minute of angle, by definition, is 1/60th of one degree.

Note the period after the sentence above.

That means that one minute of angle is an angle which subtends an arc whose length is 1.047 inches at a distance of one hundred yards.

The difference between the arc length and the chord length is 0.000004166666616672248 percent, so that's <span style="font-weight: bold"><span style="font-style: italic">not</span></span> why people refer, incorrectly, to an angle whose value is 1.00 inches at a distance of 100 yards as an MOA.

And there are people who define a "mil" as an angle of which there are 6200, 6400, and some other values in a circle, rather than the correct value for a milliradian.

Calling something which it isn't doesn't make it whatever you call it.

Both a minute of angle and a milliradian have one, and only one, correct angular value.

Another period, one will note.

 

[sniperaviator]

Re: Milrads and MOA?

They got 6200 by rounding 2*pi to 6.2.
They got 6400 by rounding 2*pi to 6.4.
(note the periods at the end of each sentence)

An MOA is an "M", an "O" and an "A", nothing more nothing less!

 

[Lindy]

Re: Milrads and MOA?

In 1897 Representative T.I. Record of Posen county, Indiana, introduced House Bill #246 in the Indiana House of Representatives to redefine the value of pi. The bill passed the House, but failed in the state Senate. (1)

The value of pi is not open to debate, nor are the minute of angle or the milliradian.

(1) For details on the effort to legislate the value of pi, see:

http://www.straightdope.com/columns/read...ing-pi-equals-3

 

[sobrbiker883]

Re: Milrads and MOA?

 

[jackinfl]

Re: Milrads and MOA?

Lindy,
I've missed you. Where have you been?
Jack

 

[woodspider]

Re: Milrads and MOA?

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Lindy</div><div class="ubbcode-body">In 1897 Representative T.I. Record of Posen county, Indiana, introduced House Bill #246 in the Indiana House of Representatives to redefine the value of pi. The bill passed the House, but failed in the state Senate. (1)

The value of pi is not open to debate, nor are the minute of angle or the milliradian.

(1) For details on the effort to legislate the value of pi, see:

http://www.straightdope.com/columns/read...ing-pi-equals-3
</div></div>
lmao, I fkin love Lindy, there is no debating that. lol

 

[gugubica]

Re: Milrads and MOA?

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: sniperaviator</div><div class="ubbcode-body">

An MOA is an "M", an "O" and an "A", nothing more nothing less! </div></div>

You do realize that MOA is an abreviation of "Minute Of Angle"...right? As in Degrees, Minutes, Seconds.

A degree is a set and accepted value (1/360th of a circle).

A radian is a set and accepted value (angle in which the arc length equals the radius).

Think about the pevious statement and why it works well for ranging targets...