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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
bullet drop and scope leveling
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<blockquote data-quote="goodgrouper" data-source="post: 103177" data-attributes="member: 2852"><p>[ QUOTE ]</p><p> I can attest to the fact that the coriolis effect of the earth spinning at different speeds (about 500 yards per second at the equator) depending on latitude is zero. </p><p></p><p>[/ QUOTE ] </p><p></p><p></p><p>I would disagree with this statement. It may be a small amount but it is still there. And the farther you shoot, the more it shows up. I have shot enough at 2000 yards plus to get some calm enough days that there was no other explanation for the phenomenon than for the "C" effect. </p><p></p><p>Another interesting point was that at 2k, every bullet that went left of the gong usually also shot high, and every bullet that went right of the gong went low. </p><p></p><p>At what points in the ocean were you shooting from the ships and did you notice a change in Coriolis as you got farther from the Equator?</p><p></p><p>But I believe that the original poster's problem (if he did truly level his scope properly) was as JBM stated. I have witnessed gyroscopic drift in every bullet fired to one degree or another and it is much more of a factor than Coriolis. If Coriolis makes 1" difference then Gyro makes 9". These are not the real amounts of course, just an example to show the magnitude in each.</p><p></p><p>If you are leaving your rifle zeroed at 1k for left-right movement and it is always on, then you have "zeroed" the "G" drift out and it may seem non apparent but it is still there although it may be in a small amount. You have simply just corrected for it.</p></blockquote><p></p>
[QUOTE="goodgrouper, post: 103177, member: 2852"] [ QUOTE ] I can attest to the fact that the coriolis effect of the earth spinning at different speeds (about 500 yards per second at the equator) depending on latitude is zero. [/ QUOTE ] I would disagree with this statement. It may be a small amount but it is still there. And the farther you shoot, the more it shows up. I have shot enough at 2000 yards plus to get some calm enough days that there was no other explanation for the phenomenon than for the "C" effect. Another interesting point was that at 2k, every bullet that went left of the gong usually also shot high, and every bullet that went right of the gong went low. At what points in the ocean were you shooting from the ships and did you notice a change in Coriolis as you got farther from the Equator? But I believe that the original poster's problem (if he did truly level his scope properly) was as JBM stated. I have witnessed gyroscopic drift in every bullet fired to one degree or another and it is much more of a factor than Coriolis. If Coriolis makes 1" difference then Gyro makes 9". These are not the real amounts of course, just an example to show the magnitude in each. If you are leaving your rifle zeroed at 1k for left-right movement and it is always on, then you have "zeroed" the "G" drift out and it may seem non apparent but it is still there although it may be in a small amount. You have simply just corrected for it. [/QUOTE]
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bullet drop and scope leveling
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