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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
9 o'clock vs. 3 o'clock wind drifts different with same wind velocity???
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<blockquote data-quote="Bart B" data-source="post: 613578" data-attributes="member: 5302"><p>Having shot both smallbore matches at 100 yards and 30 caliber matches at 1000, the wind drift is equal for both right and left hand winds. But the elevation change is quite different.</p><p></p><p>Smallbore, .22 rimfire standard velocity bullets with right hand twist track across the target from a bit more than 10-o'clock to a bit more than 4-o'clock. The string up and to the left from right hand winds and down and to the right for left hand winds. It's about a 3:1 ratio</p><p></p><p>30 caliber rounds leaving at 2500 to 3100 fps from right hand twists track across the target from about 9:10 o'clock to 3:10 o'clock. The string the same as rimfire .22 ammo, but not nearly as much; about a 15:1 or 20:1 ratio. I've made as much as 5 MOA wind correction to the right to 5 MOA to the left when the wind direction changed sides with 30 calibers at 1000 yards and not seen any change in vertical impact. It ain't much to be concerned about.</p><p></p><p>Coriolis effects with 30 calibers isn't enough for me to be concerned with. Most of its masked by the accuracy levels us humans shoot coupled with subtle air movements and therefore's very hard to measure and not typically noticed.</p></blockquote><p></p>
[QUOTE="Bart B, post: 613578, member: 5302"] Having shot both smallbore matches at 100 yards and 30 caliber matches at 1000, the wind drift is equal for both right and left hand winds. But the elevation change is quite different. Smallbore, .22 rimfire standard velocity bullets with right hand twist track across the target from a bit more than 10-o'clock to a bit more than 4-o'clock. The string up and to the left from right hand winds and down and to the right for left hand winds. It's about a 3:1 ratio 30 caliber rounds leaving at 2500 to 3100 fps from right hand twists track across the target from about 9:10 o'clock to 3:10 o'clock. The string the same as rimfire .22 ammo, but not nearly as much; about a 15:1 or 20:1 ratio. I've made as much as 5 MOA wind correction to the right to 5 MOA to the left when the wind direction changed sides with 30 calibers at 1000 yards and not seen any change in vertical impact. It ain't much to be concerned about. Coriolis effects with 30 calibers isn't enough for me to be concerned with. Most of its masked by the accuracy levels us humans shoot coupled with subtle air movements and therefore's very hard to measure and not typically noticed. [/QUOTE]
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9 o'clock vs. 3 o'clock wind drifts different with same wind velocity???
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