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Posted: 9/18/2004 1:03:30 PM EDT
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Looking for link or explanation that will explain what MOA accuracy is. Thank you |
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MOA = Minute of Angle 1 MOA is a 1 inch diameter of your shots at 100 yards. 2 MOA is a 2 inch diameter of your shots at 100 yards. So if you see someone write that their gun shoots under 1 MOA at 100 yards it means that the gun places the group of shots inside the size of a 1-inch diameter circle. |
| I always thought it was exactly 1.00" myself, but according to the October, 2003 American Rifleman "questions and answers" section, 1 minute of angle= 1.047" at 100 yards, 2.094" at 200 yards, and so on. Just a little Jeopardy trivia for you there...it would only matter about a quarter of an inch at 500 yards, and about a half-inch at 1000yards...pretty negligible but worth mentioning. |
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Think of MOA as a "cone of dispersion". As you fire rounds at a target they will impact in an area relevent to one another, the further away the target most likey the larger the area of dispersion. Thus, MOA is method of measuring consistancy relative to distance: .5MOA=a little over .5" at 100yrd. 1MOA=little over 1" at 100yrd. or .5MOA=little over .5" at 200yrds. 1MOA-little over 2" at 200yrds. Get it? |
.5MOA= little over 1" at 200 yds. Small typo there   Lonny |
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MOA is Minute Of Angle. A circle is divided into 360 degrees of course. A degree is divided into subunits, called minutes, and there are 60 minutes in one degree. Minutes are further subdivided into seconds, sixty seconds to a minute. And it works out that an angle of one minute, or one 60th of a degree, is approximately 1" at 100 yards or 100 m. Actually a tiny amount more (see dissipator556's post above), but this is close enough for what we are doing. But the is origin of the term, MOA. |
oops! ya got me. |
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1 minute is (1/60) of a degree of angle from the shooters position. If you use a little trigonometry you will find that @ 100 yards 1 MOA is equal to 1.047 inch. Not that all this has not been mentioned except for the Trig part, you can find what MOA you are shooting at any range by knowing the range (inches) the diameter of the circle around the bullet strikes and then using the Tan function. MOA=(Tan^-1(Circle Dia. / Range))*60 Matt Carper |
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