MOA notes

[Travis299]

Some folks may like data on MOA as I had to look it up. I believe that this is how to calculate one MOA at 100 yards.

1. MOA = minute of angle.
2. There are 21,600 MOAs in a circle, 360 degrees times 60 minutes = 21,600.
3. 3600 inches in 100 yards.
4. Circumference of a circle = 2 x R x 3.14159 (Pi).
5. At 100 yards the circumference = 7200" x 3.14159 = 22,619".
6. MOA at 100 yards = 22,619"/21,600 MOAs = 1 MOA = 1.047" at 100 yards".
7. A rifle that shoots 1 MOA at 100 yards would have a group that measures 1.047" or for all practicable purposes one inch.

Hope that helps with what is a MOA, and at 200 yards = 2 x 1.047", 300 = 3 x 1.047", 400 = 4 x 1.047", etc.

 

[TravisLH]

Your math is spot on sir.


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[muzzleodor2]

I don't understand why you need to calculate the circumference of a 100 yard circle in inches to know that 1 MOA is 1 inch at 100 yards. Seems pretty simple.

 

[Travis299]

I don't understand why you need to calculate the circumference of a 100 yard circle in inches to know that 1 MOA is 1 inch at 100 yards. Seems pretty simple.

How do you know 1 MOA = 1" at 100 yards?

 

[kilerhamilton]

Close enough for all practical purposes shooting under 1000yds. 1.047. Just like a mil dial is close enough to 3.6" @100yds to calculate if your brain doesn't work in metric units.

I don't understand why you need to calculate the circumference of a 100 yard circle in inches to know that 1 MOA is 1 inch at 100 yards. Seems pretty simple.

How do you know 1 MOA = 1" at 100 yards?

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[Downeast]

Like rounding off 1/10 mil equals 1 cm at 100 meters.

 

[Papa_Smurf]

Actually, 1.047" is the length of the arc of 1 moa at 100 yards, not the length of a straight line through the ends of that arc. But to get into that we would need more sig figs and its not really worth it.

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[Travis299]

Actually, 1.047" is the length of the arc of 1 moa at 100 yards, not the length of a straight line through the ends of that arc. But to get into that we would need more sig figs and its not really worth it.

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That is how I believe it is for a MRAD & MOA that it is the measured length of the arc at whatever distance that is referenced. Folks use straight line length for scope adjustments and example to move the POI 1" , (1 MOA) at 100 yards you would move 4 clicks on the dial, (1/4 MOA/click scope).