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i dont understand MOA.

This is a discussion on i dont understand MOA. within the AR Talk forums, part of the Long Gun Talk category; Originally Posted by Joeywhat I dunno...you have the manual, not me. Worst case you can either try it and find out for yourself, and contact ...


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Old 06-20-2008, 08:04 PM   #11
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Quote:
Originally Posted by Joeywhat View Post
I dunno...you have the manual, not me. Worst case you can either try it and find out for yourself, and contact the manufacturer, they would be able to tell you for sure.

i dont have a manual, or an optic yet...im trying to understand MOA, because i keep coming across it while planning the optic for my build.
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Old 06-20-2008, 08:10 PM   #12
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The confusing thing about minutes are we think it's a measurement of time.
Funny thing is, it's also a measurement of degrees.

For every 1 degree, there is 60 minutes

For every minute it's 1/60th of a degree

So MOA or Minute of Angle is just a smaller than 1 degree measurement.

Here's a link to really confuse you

Mil-dots and Minutes-of-angle - From a Technical Perspective

Hope this helps.
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Old 06-20-2008, 08:12 PM   #13
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Originally Posted by nascaraddict View Post
The confusing thing about minutes are we think it's a measurement of time.
Funny thing is, it's also a measurement of degrees.

For every 1 degree, there is 60 minutes

For every minute it's 1/60th of a degree

So MOA or Minute of Angle is just a smaller than 1 degree measurement.

Here's a link to really confuse you

Mil-dots and Minutes-of-angle - From a Technical Perspective

Hope this helps.
+1 to everything you said. That's why most of us like to keep it simple. 1" @ 100 yards, 2" @ 200 yards.. etc
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Old 06-20-2008, 08:16 PM   #14
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Originally Posted by Grip View Post
hmm...that clears it up a little better.

so say i put an eotech 512 on my rifle, and at 100 yard's im 5 inches to low....would i go up 5 click's? because it is 1 MOA?

You are confusing the reticle with the adjustments. The adjustments on the Eotech 512 is 1/2 MOA. So if you are 5" too low you need to go 10 clicks up.

Now the reticle is another thing. The outside ring is 65 MOA. The dot is 1 MOA. So what this mean is:
@ 100 yards that dot = 1" and the ring = 65"
@ 200 yards that dot = 2" and the ring = 130"
etc
etc
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Old 06-21-2008, 05:50 AM   #15
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One other thing,

When you are talking about Eotechs and red dot sights like the Aimpoint.

The manufactures list the size of the dot in MOA.

So if the Eotech says 1 MOA dot 65 MOA circle it means that the reticle dot appears to be 1" in diameter at 100 yards and the circle around the dot appears as 65" in diameter. The Aimpoint dot appears to be 4" in diameter at 100 yards.

The smaller dot will be a bit more precise, but the larger dot will be easier to see. Eotech's reticle with the 1 MOA dot and 65 MOA circle is a compromise of a smaller dot for accuracy and a big circle for speed up close. ie if they are inside the room with you just get their body in the circle and start pulling the trigger.
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Old 06-21-2008, 08:41 AM   #16
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According to Wiki"

Quote:
Minute of angle (MOA) is the measurement (in fractions of degrees) of a ballistic round's deviation from its initial heading due to gravity and/or the effect of air resistance on velocity. Informally known as a "Bullet's Trajectory" or "the rainbow effect". Long range weapons must account for this effect because a fired round falls at a quadratic rate. Weapons such as large caliber rifles use scopes with adjustments for distance and windage.
Wiki search for Minute of Arc:
Quote:
Firearms

This unit is commonly found in the firearms industry and literature, particularly that concerning the accuracy of rifles. The industry tends to refer to it as minute of angle rather than minute of arc. It is popular because 1 MOA subtends approximately one inch at 100 yards, a traditional distance on target ranges. A shooter can easily readjust his rifle scope by measuring the distance in inches the bullet hole is from the desired impact point, and adjusting the scope that many MOA in the same direction. Most target scopes designed for long distances are adjustable in quarter () or eighth (⅛) MOA "clicks". One eighth MOA is equal to approximately an eighth of an inch at 100 yards or one inch at 800 yards.


Calculating the physical equivalent group size equal to one minute of arc can be done using the equation: equivalent group size = tan(MOA ∕ 60)*distance. In the example previously given and substituting 3600 inches for 100 yards, tan(1 MOA ∕ 60)∙ 3600 inches = 1.0471975511966 inches.
In metric units 1 MOA at 100 meters = 2.90888208665722 centimeters.
Sometimes, a firearm's accuracy will be measured in MOA. This simply means that under ideal conditions, the gun is capable of repeatedly producing a group of shots whose center points (center-to-center) fit into a circle, the diameter of which can be subtended by that amount of arc. (E.g.: a "1 MOA rifle" should be capable, under ideal conditions, of shooting a 1-inch group at 100 yards, a "2 MOA rifle" a 2-inch group at 100 yards, etc.) Some manufacturers such as Weatherby and Cooper offer actual guarantees of real-world MOA performance.


Rifle manufacturers and gun magazines often refer to this capability as "Sub-MOA", meaning it shoots under 1 MOA. This is typically a single group of 3 to 5 shots at 100 yards, or the average of several groups. If larger samples are taken, i.e. more shots per group, then group size typically increases. [2]
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Old 06-21-2008, 09:59 AM   #17
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Originally Posted by Grip View Post
the manual will tell me what 1 click equal's correct?
Of course! All the optical devices I own show the click values on the knobs.
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Old 06-21-2008, 12:32 PM   #18
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Good thread.
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Old 06-21-2008, 12:51 PM   #19
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Good thread.
agreed...i have learned alot, and i still have a bunch of reading to do.

interesting subject.
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Old 06-21-2008, 12:59 PM   #20
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You've come to the right place to fill your noggin with helpful info.
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