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Rifles, Reloading, Optics, Equipment
Long Range Scopes and Other Optics
Zero Shift caused by light conditions - question for W
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<blockquote data-quote="Guest" data-source="post: 66584"><p>Hello Browndog: Hope all is well with you. Actually, for many years I thought that it was humidity that caused the poi shift, when it was actually cloud cover and sun placement. In a matter of fact, it was David Tubb who brought this to light and explained it to me. </p><p></p><p>Just a little trivia; humidity only effects the bullet impact approximately 1/10th of 1%, which equates to about 1/100th of an inch at 1000 yards. Unless it is raining, I do not take it into account; except when using Exbal software as it is part of the equation.</p><p></p><p>By the way, a 5 mph tail wind will keep your bullet down approximately 1/2 moa. Just in case you weren't aware... Many shooters believe a tail wind will cause the bullet to rise. They are mistaken.</p></blockquote><p></p>
[QUOTE="Guest, post: 66584"] Hello Browndog: Hope all is well with you. Actually, for many years I thought that it was humidity that caused the poi shift, when it was actually cloud cover and sun placement. In a matter of fact, it was David Tubb who brought this to light and explained it to me. Just a little trivia; humidity only effects the bullet impact approximately 1/10th of 1%, which equates to about 1/100th of an inch at 1000 yards. Unless it is raining, I do not take it into account; except when using Exbal software as it is part of the equation. By the way, a 5 mph tail wind will keep your bullet down approximately 1/2 moa. Just in case you weren't aware... Many shooters believe a tail wind will cause the bullet to rise. They are mistaken. [/QUOTE]
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Zero Shift caused by light conditions - question for W
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