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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
You Only Need to Know This If You Shoot Past 700 Yards!
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<blockquote data-quote="Bart B" data-source="post: 766511" data-attributes="member: 5302"><p>After ones got all the ballistics figured out and zeros for every yard of range from here to eternity, judging the sight correction for cross winds is what's left. </p><p></p><p>Do you know how to adjust your scope's focus to see the mirage (heat waves) wrinkling across the field of view and estimate its speed across the bullet's path at different distances down range? </p><p></p><p>Which range band of wind has the greatest effect on drift; winds closest to you, half way to the target or closest to the target?</p><p></p><p>With a foot or more of drift per mph of consistant cross wind speed at ranges past 1000 yards, you'll need to be able to judge cross wind speeds very accurate. And the wind never blows across the line of sight uniformly all the way to the target. To say nothing of the fact that for a given wind speed across the ground, it gets faster for each foot above ground. How much faster depends on the terrain it's blowing across; less per foot above flat, smooth ground; more with vegitation such as brush and trees as well as other obstructions. Which means the wind's blowing faster on the bullet when its at its highest point in its trajectory. Then you'll also need to correct for the wind angle relative to the line of sight.</p><p></p><p>Getting zero's is about 20% of long range first shot hit success. The rest of it's correcting for crosswinds.</p></blockquote><p></p>
[QUOTE="Bart B, post: 766511, member: 5302"] After ones got all the ballistics figured out and zeros for every yard of range from here to eternity, judging the sight correction for cross winds is what's left. Do you know how to adjust your scope's focus to see the mirage (heat waves) wrinkling across the field of view and estimate its speed across the bullet's path at different distances down range? Which range band of wind has the greatest effect on drift; winds closest to you, half way to the target or closest to the target? With a foot or more of drift per mph of consistant cross wind speed at ranges past 1000 yards, you'll need to be able to judge cross wind speeds very accurate. And the wind never blows across the line of sight uniformly all the way to the target. To say nothing of the fact that for a given wind speed across the ground, it gets faster for each foot above ground. How much faster depends on the terrain it's blowing across; less per foot above flat, smooth ground; more with vegitation such as brush and trees as well as other obstructions. Which means the wind's blowing faster on the bullet when its at its highest point in its trajectory. Then you'll also need to correct for the wind angle relative to the line of sight. Getting zero's is about 20% of long range first shot hit success. The rest of it's correcting for crosswinds. [/QUOTE]
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You Only Need to Know This If You Shoot Past 700 Yards!
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