Windage Formula!
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Topic: Windage Formula! (Read 1252 times))
JSubadya
Plinker
Posts: 216
Windage Formula!
«
on:
February 04, 2013, 11:21:17 PM »
Alot of people say that Airgun are not accurate past 70yards but I think that one of the reasons why pellets seem to fly all over past that range is because wind plays such chaos on our POI. When reading the wind correctly, airguns still retain their accuracy past 100yards!
This is a Windage formula I have developed to use in the field. It works with the .25 JSB Exact Kings 25.39grain. shot from 800 - 1,000fps. Corrections are for FULL VALUE WIND.
The Formula is:
(Distance/100 + A) X Wind(in MPH) = Minutes of Angle Adjustments(MOA)
(A) =
From 0-99 yards: A = 0
From 100 - 129 yards: A = 0.05
From 130 - 149 yards: A = 0.1
From 150 - 169 yards: A = 0.15
From 170 - 185 yards: A = 0.2
From 186 - 199 Yards: A = 0.25
From 200 - ya right Yards: A = 0.3
For the Distance, you can round to the nearest denomination of 10. So 123 yards would just be 120.
So for example, if there is a target at 138 yards with a 4MPH wind blowing from the LEFT here is how you would find your MOA corrections:
(Distance/100 + A) X Wind(in MPH) = Minutes of Angle Adjustments(MOA)
Distance = 140yards
A = 0.1
Wind = 4
(140/100 + 0.1) X 4 = MOA
(1.40 + 0.1) X 4 = MOA
(1.5) X 4 = MOA
6 = MOA
So then you would just dial in 6 MOA Left to compensate for the wind. Now this wont give you precise accuracy, but it is a simple formula that can be used on the fly and will get you close enough! Good shooting!
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Pasadena
I enjoy long range shooting with my airguns(100+yards). I produce military style targets for highpowered airguns. Looking for a target for your 40+Fpe airgun? Ask me or check out MilTargets.com!
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Windage Formula!