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The Basics, Starting Out
Wind Drift formula
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<blockquote data-quote="User4302021" data-source="post: 1670825" data-attributes="member: 105322"><p>For an unknown combination, You have to know the actual drift and then reorder the equation to derive the constant.</p><p></p><p>(Wind mph) x (yards/100) / MOA correction = constant.</p><p></p><p>..but there is a better way...</p><p></p><p>If using MOA, find the full value wind that drifts your bullet 5 MOA at 1000 yards. You can use JBM Ballistics online, it's free and it works. Or use any other app you might have access to.</p><p></p><p>This same wind should give you 0.5 MOA drift per 100 yards.</p><p></p><p>For 6.5 Creed, I can tell you that your base full value wind with this method will be about 9mph.</p><p></p><p>If you still want to use the old Marine Corps formula you are talking about, your constant will be somewhere around 16 or 17, depending on your rifle and load.</p></blockquote><p></p>
[QUOTE="User4302021, post: 1670825, member: 105322"] For an unknown combination, You have to know the actual drift and then reorder the equation to derive the constant. (Wind mph) x (yards/100) / MOA correction = constant. ..but there is a better way... If using MOA, find the full value wind that drifts your bullet 5 MOA at 1000 yards. You can use JBM Ballistics online, it's free and it works. Or use any other app you might have access to. This same wind should give you 0.5 MOA drift per 100 yards. For 6.5 Creed, I can tell you that your base full value wind with this method will be about 9mph. If you still want to use the old Marine Corps formula you are talking about, your constant will be somewhere around 16 or 17, depending on your rifle and load. [/QUOTE]
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Wind Drift formula
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