View Full Version : Teechnical: Zeroes and MOA?
January 06, 2001, 08:34
I would appreciate it if someone could explain MOA to me in some detail. I think I knew what it was and how to determine it at one time, years ago, but have since forgotten.
If you think it will bore the rest of the group please feel free to e-mail me.
January 06, 2001, 08:57
One Minute of Angle is the arc subtended by one minute at any given range. If you do 2-pi-r at a given range r (and pie are round in Jaw-ja!), then you have the circumfrence of a circle. Divide by 21600 (360 degrees x 60 minutes/degree) and you have the means to determine 1 MOA at that range.
For 100 yards, 1 MOA = 1.047"
1 mil subtends 1/6400 of a circle's circumfrence. Conveniently, this means 1 meter at 1000 meters, .1 meter at 100m, yadayada. Metric FALs make mechanical click adjustments of 1cm at 100m, or .01m. This is phenomenal resolution (.1 mil) for a mechanical sight. 1cm = .3937", BTW.
1*.....Train Like You Fight: Second Place is NOT an Option.
E.M. (Ted) Dannemiller II
January 06, 2001, 12:16
In laymen's terms:
an MOA would represent roughly 1" deviation (groups)at 100 yards/meters. 2MOA would represent roughly 2" deviation (groups) at 100yds/meters.
As the distance increases the deviation increases proportionately.
2"@100 = 4"@200 = 6"@300 = 8"@400 = 20"@1000
An average sized man is probably close to 24" wide at the shoulders. You can use that to accurately estimate the distance to a target using the stadia marks on a scope.
MOA is an easy way of estimating what your rifle is capable of without any operator error. Reducing the operator error is the unseen, and most critical, element to the equation http://www.fnfal.com/forums/smile.gif
[This message has been edited by Revolt Now (edited January 06, 2001).]
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