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Long Range Hunting & Shooting
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<blockquote data-quote="Song Dogger" data-source="post: 1495766" data-attributes="member: 101648"><p>This is a long thread, difficult for posters to read through what's already been stated - so, I appreciate a new viewpoint like this.</p><p></p><p>But, if the Geovid gives me a true horizontal distance of 450 yds, the line of sight is actually only 450.1 yds (450 / Cosine 1). One degree is negligible. To jump to your estimated line-of-sight of 500 yds, the angle would need to be 26 degrees. Vertical drop is 24 feet (450 x Tangent 1), so you did estimate that closely.</p><p></p><p>As for the headwind, I understand the concept of updraft. But, I'm not good enough to estimate if that headwind was parallel to the ground at 1 degree (a true headwind) or a 0 degree headwind acting with an upward vertical force component on the bullet. But, again, at one degree, that upward force component seems very, very small.</p><p></p><p>You have a ballistic calculator showing 3 MOA of drift for a 10 mph <u>headwind</u> on a 1 degree slope? By drift, are you saying upwards (updraft), not left or right? And, you say "full value" wind is defined as 90 degrees to the bullet's flight path - but nothing, not even updraft, is acting 90 degrees to the bullet path, right? I'm unfamiliar with ground effect, and how it can make air denser in a prone vs bench position (2-3 feet of elevation difference). I'm not following this well at all.</p></blockquote><p></p>
[QUOTE="Song Dogger, post: 1495766, member: 101648"] This is a long thread, difficult for posters to read through what's already been stated - so, I appreciate a new viewpoint like this. But, if the Geovid gives me a true horizontal distance of 450 yds, the line of sight is actually only 450.1 yds (450 / Cosine 1). One degree is negligible. To jump to your estimated line-of-sight of 500 yds, the angle would need to be 26 degrees. Vertical drop is 24 feet (450 x Tangent 1), so you did estimate that closely. As for the headwind, I understand the concept of updraft. But, I'm not good enough to estimate if that headwind was parallel to the ground at 1 degree (a true headwind) or a 0 degree headwind acting with an upward vertical force component on the bullet. But, again, at one degree, that upward force component seems very, very small. You have a ballistic calculator showing 3 MOA of drift for a 10 mph [U]headwind[/U] on a 1 degree slope? By drift, are you saying upwards (updraft), not left or right? And, you say "full value" wind is defined as 90 degrees to the bullet's flight path - but nothing, not even updraft, is acting 90 degrees to the bullet path, right? I'm unfamiliar with ground effect, and how it can make air denser in a prone vs bench position (2-3 feet of elevation difference). I'm not following this well at all. [/QUOTE]
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