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Define MOA

Discussion in 'General Gun Discussions' started by Picknlittle, Apr 15, 2007.

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  1. Picknlittle

    Picknlittle Member

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    I think I understand in a very basic way what minute of angle is, but I don't have a practical or functional understanding of the term.

    What is MOA?

    How is it measured at 100, 200, 300,....500 yds or more?
     
  2. BobMcG

    BobMcG Member

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    Correct me if I'm wrong, but it would mean 1"dia @100yds; 2"dia @ 200yds; 3"dia @300yds; 4"dia @ 400yds; 5"dia @ 500yds; etc.
     
  3. Jimmie

    Jimmie Member

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  4. Fly320s

    Fly320s Member

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    A. Middle Of Armadillo

    B. Most of America

    C. Minute Of Angle

    Choose correctly and win a prize. :neener:
     
  5. Quintin Likely

    Quintin Likely Member

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    The official definition of MOA, or minute of arc, is that it's a unit of angular measurement, equal to 1/60 of a degree.

    1 MOA at 100 yards subtends to 1.04719756 inches if you wanted to be exact. It's rounded off to 1" at 100 yards, or 1" for every 100 yards. A 1 MOA rifle at 100 yards will shoot into approximately a 1" group. A 1 MOA rifle at 200 yards is 2", 1 MOA at 300 yards is 3", and so on.
     
  6. MachIVshooter

    MachIVshooter Member

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    A term used way too often to describe rifles that are nowhere near.;)

    Quintin gave the correct technical definition.
     
  7. Picknlittle

    Picknlittle Member

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    Many thanks! I think I got it now. I can shoot one shot groups all day at that! :)
     
  8. bakert

    bakert Member

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    My understanding is it computes to just a hair over one inch at 100 yards. I've found that more people get 1" groups at 100 yards with a keyboard than a rifle:D
     
  9. svtruth

    svtruth Member

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    Minute of Arc

    And, yes, just fractionally off 1"@100 yds.
     
  10. Quintin Likely

    Quintin Likely Member

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    Oh yeah, MOA also applies to some scope and sight adjustments.

    For sake of ease, let's say you're shooting a rifle with iron sights that have 1 MOA windage and elevation adjustments at 100 yards. Maintaining the same point of aim after you've zeroed the rifle, a one MOA or minute elevation click up will (should) shift the bullet's impact 1" up. A one MOA or minute windage click left or right will (should) shift the bullet's impact 1" left or right accordingly. I say "should," because some sights and scopes adjustments aren't exactly true.

    This varies of course depending on the sights or scope you're using - some sights and most scopes have adjustments finer than 1 MOA. A sight or scope that has 1/4 MOA adjustments for windage and elevation will result in a .25" change in the bullet's strike at 100 yards depending on which way you're cranking on those dials.
     
  11. Leatherneck

    Leatherneck Member

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    Just to expand on what Quintin said, do not equate "one click" of sight adjustment with "One MOA." That may be true on some particular rifle, but usually clicks are finer than that.

    TC
     
  12. Picknlittle

    Picknlittle Member

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    Most scopes are advertised as having 1/4 MOA adjustments.
     
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