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Setting Up For The Long Range Shot, by Shawn Carlock
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<blockquote data-quote="Shawn Carlock" data-source="post: 162984" data-attributes="member: 4"><p>Eaglet,</p><p> </p><p> I am writing an article for the forum on reading the wind as we speak. I will cover this in detail, but simply put most people read wind with little reguard to what happens when it goes over a terrain feature. This effect is most common in a head or tail wind but can also be seen in a full cross wind if you are shooting across the head of a canyon for instance and the wind in the canyon go into or out of it some how. The easy way to think about it is to imagine standing at the head of a canyon shooting way down it in to the bottom with a head wind. Let's say there is a steep angle of 45 degrees from you down to the head of the canyon where it starts to run down range from you. If you are 300 yards from the head of the canyon and 300 yards from the bottom of the canyon with a 10 mph head wind and shooting 600 yards your shot will be high by about the same value as a 300 yard 1/2 value cross wind @ 10 mph. If I see this condition I would subtract that number from my elevation. I used this method to get some great video footage at 1602 yards hitting a 12" disk I had a lift that I had estimated to be effecting my elevation 2.00 MOA I was close the effect ended upo being 2.50 MOA. Hope this helps and like I said I will have a much more detailed and pictured article later.</p></blockquote><p></p>
[QUOTE="Shawn Carlock, post: 162984, member: 4"] Eaglet, I am writing an article for the forum on reading the wind as we speak. I will cover this in detail, but simply put most people read wind with little reguard to what happens when it goes over a terrain feature. This effect is most common in a head or tail wind but can also be seen in a full cross wind if you are shooting across the head of a canyon for instance and the wind in the canyon go into or out of it some how. The easy way to think about it is to imagine standing at the head of a canyon shooting way down it in to the bottom with a head wind. Let's say there is a steep angle of 45 degrees from you down to the head of the canyon where it starts to run down range from you. If you are 300 yards from the head of the canyon and 300 yards from the bottom of the canyon with a 10 mph head wind and shooting 600 yards your shot will be high by about the same value as a 300 yard 1/2 value cross wind @ 10 mph. If I see this condition I would subtract that number from my elevation. I used this method to get some great video footage at 1602 yards hitting a 12" disk I had a lift that I had estimated to be effecting my elevation 2.00 MOA I was close the effect ended upo being 2.50 MOA. Hope this helps and like I said I will have a much more detailed and pictured article later. [/QUOTE]
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Setting Up For The Long Range Shot, by Shawn Carlock
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