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Long Range Hunting & Shooting
Shooting across valleys and windage?
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<blockquote data-quote="EXPRESS" data-source="post: 1168224" data-attributes="member: 1441"><p>I know, as a helicopter pilot that wind in gullies can be up to 20% stronger when channeled up a valley. </p><p>The THLR range cards have a little diagram showing the shape and depth of a series of valleys, and what additional clicks are needed when shooting across such valleys or canyons. The diagram seems flawed in that it only give a number of clicks and there no explanation of the relevant distances involved.</p><p></p><p>However this is the only reference I can find to the phenomenon in shooting.</p><p></p><p>So I recently set up new turret label for a new load as part of my shooting routine I decided to shoot one cold bore shot every couple of days at a steel target 640 yards from my house. </p><p></p><p>Each day I've had the same kind of wind, and given the same windage; around .4 MIL for a 4-4.5mph 10 o'clock wind. The shot crosses a fairly "average" valley.</p><p></p><p>Three shots so far have all hit within 1" of each other, but all .3MIL downwind. </p><p></p><p>I will double check zero, but I can't help but wonder if it is something is amiss? </p><p></p><p>The windage comes from the drop chart ballistics, which has been trued and verified out to 1356 yards so I can confidently say that we can it has to be very close to perfect.</p><p></p><p>Amyone else ever have this issue?</p></blockquote><p></p>
[QUOTE="EXPRESS, post: 1168224, member: 1441"] I know, as a helicopter pilot that wind in gullies can be up to 20% stronger when channeled up a valley. The THLR range cards have a little diagram showing the shape and depth of a series of valleys, and what additional clicks are needed when shooting across such valleys or canyons. The diagram seems flawed in that it only give a number of clicks and there no explanation of the relevant distances involved. However this is the only reference I can find to the phenomenon in shooting. So I recently set up new turret label for a new load as part of my shooting routine I decided to shoot one cold bore shot every couple of days at a steel target 640 yards from my house. Each day I've had the same kind of wind, and given the same windage; around .4 MIL for a 4-4.5mph 10 o'clock wind. The shot crosses a fairly "average" valley. Three shots so far have all hit within 1" of each other, but all .3MIL downwind. I will double check zero, but I can't help but wonder if it is something is amiss? The windage comes from the drop chart ballistics, which has been trued and verified out to 1356 yards so I can confidently say that we can it has to be very close to perfect. Amyone else ever have this issue? [/QUOTE]
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Shooting across valleys and windage?
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