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Long Range Hunting & Shooting
Let's all stop doing it wrong! (Wind Call Verbage)
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<blockquote data-quote="SBruce" data-source="post: 488965" data-attributes="member: 21068"><p>Let's take the example of a 45 degree wind. The ballistic programs will give you a drift value of .71 or 71% of what a 90 degree true crosswind gives. There is also a vertical displacement, but that's another story. So we'll just use this example for now.</p><p> </p><p>My new coyote rifle should drift 20" at 600 yds with a true 90 degree crosswind at 10 mph (not at all unrealistic in Wyoming). Let's say that the wind is blowing from 1:30 or 45 degrees right of dead ahead and I use the old "1/2 value" adjustment. That means I hold or dial 10 inches for wind. When the true displacement is actually 14.2", over 4" more drift than I've figured. </p><p> </p><p>This said coyote is sitting on his butt barking at me and wont come any closer. His chest cavity is only about 8" wide counting the fur. I hold dead center (leaves 4" each side to play with) and miss!! Worse yet, just nick him and burn his skin on the left side, now he's a very educated coyote!! Next time, he'll just turn and high tail it out of the country when he hears a call.</p><p> </p><p>This example is not a 1/2 minute target, but a larger than 1 minute target. If it were a prarie dog (a 1/2 minute target) it would be a clean miss, and a miss by nearly a full praire dog width.</p></blockquote><p></p>
[QUOTE="SBruce, post: 488965, member: 21068"] Let's take the example of a 45 degree wind. The ballistic programs will give you a drift value of .71 or 71% of what a 90 degree true crosswind gives. There is also a vertical displacement, but that's another story. So we'll just use this example for now. My new coyote rifle should drift 20" at 600 yds with a true 90 degree crosswind at 10 mph (not at all unrealistic in Wyoming). Let's say that the wind is blowing from 1:30 or 45 degrees right of dead ahead and I use the old "1/2 value" adjustment. That means I hold or dial 10 inches for wind. When the true displacement is actually 14.2", over 4" more drift than I've figured. This said coyote is sitting on his butt barking at me and wont come any closer. His chest cavity is only about 8" wide counting the fur. I hold dead center (leaves 4" each side to play with) and miss!! Worse yet, just nick him and burn his skin on the left side, now he's a very educated coyote!! Next time, he'll just turn and high tail it out of the country when he hears a call. This example is not a 1/2 minute target, but a larger than 1 minute target. If it were a prarie dog (a 1/2 minute target) it would be a clean miss, and a miss by nearly a full praire dog width. [/QUOTE]
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Let's all stop doing it wrong! (Wind Call Verbage)
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