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Long Range Hunting & Shooting
spin drift & Coriolis effect
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<blockquote data-quote="tresmon" data-source="post: 488009" data-attributes="member: 12397"><p>I teach it in detail in my LONG Range shooting Seminar.</p><p></p><p>I disagree with the blog guys statement that he feels it doesn't matter if you not going to be making 1500y cold bore shots.</p><p></p><p>For my long range rifle Coriolis is worth 3" right at 1000 yds, a range I shoot at frequently.</p><p>Coriolis is worth "about" (too lazy to look up the exact figure right now) another 3" right.</p><p></p><p>So if I guess what the wind is going to do to my bullet @ 1000 yards perfectly ("perfectly?" basically not possible) set my sights perfectly for 1000, break the shot perfectly, the ammo & velocity is perfect- I'm still going to miss the mark by 6" due to Spin D and Cori alone.</p><p></p><p>Now Me and every other HONEST down to earth shooter will admit they need all the help they can get for long range cold bore shots. We estimate the wind but will be a little off. Our MV varies shot to shot. All these minopr unavoidable erros stack up in long range shots so yes you had better account for Cori & spin D. We need all the help we can get at long range.</p><p></p><p>As a side note: if we inhabitants of the northern hemisphere were smart we'd shoot barrels with left hand twist rifling. This would pit spin drift and cori against each other and mostly cancel the two out!</p><p></p><p>Come to class!</p><p><a href="http://www.longrangehunting.com/forums/f17/tresmons-long-range-shooting-class-nashville-tn-3-19-a-68987/" target="_blank">http://www.longrangehunting.com/forums/f17/tresmons-long-range-shooting-class-nashville-tn-3-19-a-68987/</a></p></blockquote><p></p>
[QUOTE="tresmon, post: 488009, member: 12397"] I teach it in detail in my LONG Range shooting Seminar. I disagree with the blog guys statement that he feels it doesn't matter if you not going to be making 1500y cold bore shots. For my long range rifle Coriolis is worth 3" right at 1000 yds, a range I shoot at frequently. Coriolis is worth "about" (too lazy to look up the exact figure right now) another 3" right. So if I guess what the wind is going to do to my bullet @ 1000 yards perfectly ("perfectly?" basically not possible) set my sights perfectly for 1000, break the shot perfectly, the ammo & velocity is perfect- I'm still going to miss the mark by 6" due to Spin D and Cori alone. Now Me and every other HONEST down to earth shooter will admit they need all the help they can get for long range cold bore shots. We estimate the wind but will be a little off. Our MV varies shot to shot. All these minopr unavoidable erros stack up in long range shots so yes you had better account for Cori & spin D. We need all the help we can get at long range. As a side note: if we inhabitants of the northern hemisphere were smart we'd shoot barrels with left hand twist rifling. This would pit spin drift and cori against each other and mostly cancel the two out! Come to class! [url]http://www.longrangehunting.com/forums/f17/tresmons-long-range-shooting-class-nashville-tn-3-19-a-68987/[/url] [/QUOTE]
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