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Please help me understand MOA

 
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  #1  
Old 12-20-2009, 05:14 AM
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Please help me understand MOA

I believe I have this down but still scratching my head.

Here is an example:

My target is ranged at 500 yards.

My .243 has a -41.6" drop at 500 yards. (200 yard sight it)

My scope is a VX2 3x9x40

If I understand this correctly, there are (1/4" adjustments) 4 clicks per ONE moa.

So if I ranged this target with my RXII Range finder, it would tell me (if all the numbers are correct), that I would have to adjust UP 166 MOA. Is that correct?

So then I would have to lay there and click 166 clicks so that my crosshairs are dead on with my target?

Thanks-
Nick
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  #2  
Old 12-20-2009, 07:44 AM
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Re: Please help me understand MOA

Yep, 166 clicks x .25 = 41.5 inches. The VX-II's specs shows 56 MOA. You might need a 15 or 20 MOA base to do this but I'm sure the pros will chime in.

Good luck!
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Last edited by FEENIX; 12-20-2009 at 10:09 AM.
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  #3  
Old 12-20-2009, 09:40 AM
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Re: Please help me understand MOA

nope, not correct

41.6" at 500 yards is not 41.6 moa it is inches of drop, to convert it to MOA range in hundreds of yards is part of the equasion

41.6 divided by MOA 1.0473"=39.7 now divide this by range in hundreds of yards
39.7 divided by 5= 7.94 MOA so 29 clicks of your scope should do it.

1 moa is 1.0473" at 100 yards
1 moa is 1.0473" per 100 yards of range so moa at 500 would be
1.0473 (MOA)x5 (range in hundreds of yards)=5.2365" 1MOA at 500 yards

each 1/4 MOA click of the scope moves bullet impact .261 at 100 yards at 500 yards each click is
.261 (moa)x5 (range in hundreds of yards) = 1.305" per 1/4 moa click
So moa at 822 yards is
1.0473 (moa) X 8.22 (range in hundreds of yards)= 8.608" moa at 822 yards each 1/4 moa click would move POI 2.152" at 822 yards

what the scope adjustments do is each MOA changes the angle of your muzzle by about .0069", your crosshairs actualy move down when you dial up, forcing you to raise the muzzle to the correct POA, since your changing the angle of you muzzle it changes the flight of the bullet more the farther the distance.

MOA= minute of angle, a unit of angular measurement equal to 1/60th of 1, actualy equals 1.0473" per 100 yards of range,
so MOA is actualy 2.0496" at 200
3.142" at 300
4.19" at 400
5.24 at 500
10.473" at 1000 yards
Hope this helps
RR
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Last edited by Ridge Runner; 12-20-2009 at 09:50 AM.
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  #4  
Old 12-20-2009, 09:51 AM
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Re: Please help me understand MOA

Quote:
Originally Posted by Ridge Runner View Post
nope, not correct

41.6" at 500 yards is not 41.6 moa.

41.6 divided by MOA 1.0473"=39.7 now divide this by range in hundreds of yards
39.7 divided by 5= 7.94 MOA so 29 clicks of your scope should do it.

1 moa is 1.0473" at 100 yards
1 moa is 1.0473" per 100 yards of range so moa at 500 would be
1.0473 (MOA)x5 (range in hundreds of yards)=5.2365" 1MOA at 500 yards

each 1/4 MOA click of the scope moves bullet impact .261 at 100 yards at 500 yards each click is
.261 (moa)x5 (range in hundreds of yards) = 1.305" per 1/4 moa click
So moa at 822 yards is
1.0473 (moa) X 8.22 (range in hundreds of yards)= 8.608" moa at 822 yards each 1/4 moa click would move POI 2.152" at 822 yards

what the scope adjustments do is each MOA changes the angle of your muzzle by about .0069", your crosshairs actualy move down when you dial up, forcing you to raise the muzzle to the correct POA, since your changing the angle of you muzzle it changes the flight of the bullet more the farther the distance.

MOA= minute of angle, a unit of angular measurement equal to 1/60th of 1, actualy equals 1.0473" per 100 yards of range,
so MOA is actualy 2.0496" at 200
3.142" at 300
4.19" at 400
5.24 at 500
10.473" at 1000 yards
Hope this helps
RR
Cool, that's good to know, I too am new with this (been using BP and B&C) and have the same VX-II scope ... and thanks for the correction/education.

Ed
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Last edited by FEENIX; 12-20-2009 at 10:11 AM.
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  #5  
Old 12-20-2009, 01:14 PM
KRP KRP is offline
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Re: Please help me understand MOA

29 1/4 MOA "clicks" is only 7.25 MOA. 32 "clicks"(8 MOA) would be much closer to the needed 7.94 adjustment. If the scope actually has 1/4" "clicks" as you state you would need closer to 33 "clicks"(8.25 IPHY). My opinion is you will find it easier to stop thinking in "clicks" and start thinking in MOA(or whatever the adjustments on the scope are).
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  #6  
Old 12-20-2009, 02:23 PM
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Re: Please help me understand MOA

Quote:
Quote:
Originally Posted by KRP View Post
29 1/4 MOA "clicks" is only 7.25 MOA. 32 "clicks"(8 MOA) would be much closer to the needed 7.94 adjustment. If the scope actually has 1/4" "clicks" as you state you would need closer to 33 "clicks"(8.25 IPHY). My opinion is you will find it easier to stop thinking in "clicks" and start thinking in MOA(or whatever the adjustments on the scope are).
Plus one... it's easier to stop thinking in clicks and start thinking in MOA. Less counting.

Another thing... I'm not an expert on Leupy's but some scopes say MOA and are really calibrated to inches per hundred yards (IPHY). You need to know which system you have to get right drop.

Mark
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  #7  
Old 12-20-2009, 02:35 PM
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Re: Please help me understand MOA

Have the same scope. Interesting discussion. I am learning with this thread
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