Moa???

strider007

strider007

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Can somebody please explain to me what MOA means? Sorry if it's somewhat of a dumb question (in my case, anyway), but I'm slowly getting into rifles and all that other good stuff that goes along with them, and I figured that it's time I start learning about this stuff so that I can finally go out and buy this stuff with a little confidence...or just make the guy at the scope and firearm counter think that I know what I'm talking about! And, oh, sorry for the previous run-on sentence!!!
 
My understanding of minute of angle refers to the arc of a projectile at a certain distance. functionally, it amounts to a grouping on a target of a certain size; which most people would be referring to when they are talking about accuracy. Basically, your scope would adjust your point of aim a certain amount of degrees to change this arc slightly and hit your target, but the amount would differ at different ranges. I would also appreciate if anyone could fill in the details more accurately though:)
 
angles are measured in degrees:minutes:seconds

360 degrees
60 minutes
60 seconds

so 1 MOA is 1/60 of a degree

think of a cone emanating from your bore. It gets larger the further away you get, just like your groups. So 1 MOA at 100m is half the size as at 200.

moa.gif
 
And further, if you say your rifle can shoot 1 min, that means, 1" at 100 yards, 2" a 200 yards, 3" at 300 yards. If you shoot 6" groups at 300 yards, you have a 2 min rifle. This is all very rough of course and Canam's description is far more correct than mine.

Scott
 
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, 3600 tan(1 MOA/60) inches = 1.0471975511966 inches.
In metric units 1 MOA at 100 meters = 2.908 centimeters.
 
Nice!

CanAm said:
angles are measured in degrees:minutes:seconds

360 degrees
60 minutes
60 seconds

so 1 MOA is 1/60 of a degree

think of a cone emanating from your bore. It gets larger the further away you get, just like your groups. So 1 MOA at 100m is half the size as at 200.

moa.gif
Click to expand...

Could not have said it better myself. Best explanation i've heard yet
 
strider007 said:
Hey bear, how were your math scores in high school?
Click to expand...

depending on the year 90 - 104 .... and before you ask I also got 118 in Grade 10 Data Processing...

I was usually done my assignments before most of the others had started... So I always had bonus assignments becuase if I didn't I would get into trouble..... On one exam... I came up with something the teacher never thought of...

Yes I was a geek......... OK maybe I still am... But that's just the glasses and pocket protector....
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BUT the above I clipped from Wikipedia.. Mind you I had the formula kicking around... and I had done a CAD drawing and had the numbers already...
 
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