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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: 614072" data-attributes="member: 5302"><p>Target shooters do not always get sighting shots before the scoring starts. In many individual and team matches, no sighters are allowed. Besides, they've all got windage zeros for all the ranges they shoot at; for some it stays the same but for others it changes. M1 and M14 rifles often have windage zeros change with range. </p><p></p><p>Rarely is their sight's elevation adjustment axis (nor anyone elses, for that matter) perfectly aligned in the plane between the bore axis and sight axis. And even when it is, the horizontal direction the bore points to when the bullet exits is different than when the round's fired and the bullet leaves the case mouth. And that varies with the shooting position.</p><p></p><p>There might be 5 people on this planet who can judge cross wind values accurate enough to put the first shot within 1/2 MOA of point of aim at long range with cross winds less than 5 mph. I'm not one of them. There's too many other subtle cross wind values between shooter and target that are invisible to even the aided eye. These conditions mask any coriolis drift and sight elevation axis errors that exist. So how anyone can separate on-target results into which ones' horizontal error was cause by what is something to consider. This is the main reason the top long range rifle team coaches don't concern themselves with coriolis effects. Even when the bullet fired drifts only 6 inches per mph of uniform crosswind at 1000 yards.</p></blockquote><p></p>
[QUOTE="Bart B, post: 614072, member: 5302"] Target shooters do not always get sighting shots before the scoring starts. In many individual and team matches, no sighters are allowed. Besides, they've all got windage zeros for all the ranges they shoot at; for some it stays the same but for others it changes. M1 and M14 rifles often have windage zeros change with range. Rarely is their sight's elevation adjustment axis (nor anyone elses, for that matter) perfectly aligned in the plane between the bore axis and sight axis. And even when it is, the horizontal direction the bore points to when the bullet exits is different than when the round's fired and the bullet leaves the case mouth. And that varies with the shooting position. There might be 5 people on this planet who can judge cross wind values accurate enough to put the first shot within 1/2 MOA of point of aim at long range with cross winds less than 5 mph. I'm not one of them. There's too many other subtle cross wind values between shooter and target that are invisible to even the aided eye. These conditions mask any coriolis drift and sight elevation axis errors that exist. So how anyone can separate on-target results into which ones' horizontal error was cause by what is something to consider. This is the main reason the top long range rifle team coaches don't concern themselves with coriolis effects. Even when the bullet fired drifts only 6 inches per mph of uniform crosswind at 1000 yards. [/QUOTE]
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9 o'clock vs. 3 o'clock wind drifts different with same wind velocity???
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