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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Vertical component of wind drift
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<blockquote data-quote="Brent" data-source="post: 26182" data-attributes="member: 99"><p>Len,</p><p></p><p>Do you have a copy of Harold Vaughn's book "Rifle Accuracy Facts" already? If you don't I suggest you get your hands on a copy, you'd love like it alot. It has a way to test what the vertical component actually is with your bullet. I won't bother if you already have read it though. </p><p></p><p>15 degrees from horizontal is close to his example, his was 17 deg for a 68gn 6mm match bullet with a GS of 1.38 (gyroscopic stability factor) at sea level. </p><p></p><p>To give you a little example, he shot a group at 200 yards with wind at varying intensities coming from 3 o'clock to produce a line of impacts from the wind drift that stretched right to left the harder the wind blew. The group looks to be in the order of an inch and a half, but, also the harder the wind blew, the higher the shot impacted because of the vertical component. It has alot to do with the GS, wind speed and range. The higher the wind speed and or the higher the GS and the longer the distance the more vertical wind drift component will be. </p><p></p><p>I can post a pic if you like to show you an illistration if you haven't read the book and seen it yet?</p></blockquote><p></p>
[QUOTE="Brent, post: 26182, member: 99"] Len, Do you have a copy of Harold Vaughn's book "Rifle Accuracy Facts" already? If you don't I suggest you get your hands on a copy, you'd love like it alot. It has a way to test what the vertical component actually is with your bullet. I won't bother if you already have read it though. 15 degrees from horizontal is close to his example, his was 17 deg for a 68gn 6mm match bullet with a GS of 1.38 (gyroscopic stability factor) at sea level. To give you a little example, he shot a group at 200 yards with wind at varying intensities coming from 3 o'clock to produce a line of impacts from the wind drift that stretched right to left the harder the wind blew. The group looks to be in the order of an inch and a half, but, also the harder the wind blew, the higher the shot impacted because of the vertical component. It has alot to do with the GS, wind speed and range. The higher the wind speed and or the higher the GS and the longer the distance the more vertical wind drift component will be. I can post a pic if you like to show you an illistration if you haven't read the book and seen it yet? [/QUOTE]
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Vertical component of wind drift
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