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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
spin drift
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<blockquote data-quote="JRu" data-source="post: 249889" data-attributes="member: 6837"><p>You can only measure SD on dead calm days, or in very steady uniform winds. You really only need to measure it to the closest 1/2 MOA to be effective.</p><p></p><p>Yes a 1 mph wind would throw the measurement off, but then it would have to be a steady, average, uniform 1 mph wind over the whole range. A 1 mph breeze affecting 10% of the flight path somewhere around the middle is not going to throw the bullet off 1 or even 1/2 MOA.</p><p></p><p>Could be a geographic thing but over here in Finland at around 300ft elevation, surrounded by forest, dead calm is not an anomaly.</p><p></p><p></p><p></p><p>If people are able to precisely determine their 1000yd zeros even with "trigger control, shooter induced error and group margin error" , they should be able to see if the group center is 6 to 12" off to the side. We're not talking about 1" right or left, that's just insignificant. I just need to know if my SD is around 0, 1/2 or 1 MOA at 1k, I'll turn that value into wind speed and I should be close enough for field shooting just adding that left to right wind value at ranges over 600 or so.</p><p></p><p></p><p></p><p>Some do and it works just fine.</p></blockquote><p></p>
[QUOTE="JRu, post: 249889, member: 6837"] You can only measure SD on dead calm days, or in very steady uniform winds. You really only need to measure it to the closest 1/2 MOA to be effective. Yes a 1 mph wind would throw the measurement off, but then it would have to be a steady, average, uniform 1 mph wind over the whole range. A 1 mph breeze affecting 10% of the flight path somewhere around the middle is not going to throw the bullet off 1 or even 1/2 MOA. Could be a geographic thing but over here in Finland at around 300ft elevation, surrounded by forest, dead calm is not an anomaly. If people are able to precisely determine their 1000yd zeros even with "trigger control, shooter induced error and group margin error" , they should be able to see if the group center is 6 to 12" off to the side. We're not talking about 1" right or left, that's just insignificant. I just need to know if my SD is around 0, 1/2 or 1 MOA at 1k, I'll turn that value into wind speed and I should be close enough for field shooting just adding that left to right wind value at ranges over 600 or so. Some do and it works just fine. [/QUOTE]
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