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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
spin drift
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<blockquote data-quote="Pdvdh" data-source="post: 249904" data-attributes="member: 4191"><p>It's really pretty simple. After confirming your rifle is dead on at 200 to 300 yds, shoot a group on a windless day at 1000 yds. Measure how far the group is to the right of POA. Subtract Coriolis drift and your left with spindrift. If you're 1000 yd group measures 12 or more inches, don't worry about measuring your spindrift, because your outfit isn't fit for 1000 yd shots anyway. But if you shoot a 0.7 moa group or less at 1000 yds and the center of that group is 11-12" right, then subtract Coriolis drift and then you'll have your spindrift.</p><p></p><p>Yes, if it's windy out, the wind will affect the bullet's POI more than spindrift, but <strong>are you trying to convince us we should ignore 6-10" spindrift @ 1000 yds because the wind might be blowing? </strong>Would you ignore a known, constant 90 degree 1 mph wind on a 1000 yd shot? That's about what spindrift amounts to. Once you've figured out how much spindrift your rifle/bullet/load combination produces, it's guaranteed to be present on each and every shot. I've spent the time to determine my spindrift, and know that I know how much drift I experience @ 1000 yds, I'd feel pretty foolish ignoring it. </p><p></p><p>We don't all live in wind alley. But even if I did, there's no reason for me not to allow for the 9" of spindrift on each and every shot. In the wind conditions you described, most won't be shooting at anything other than targets at 1000 yds. Your example is along the lines of, "<em>if you're shooting through a tornado, is spindrift really an issue</em>?" The answer is no, not if I don't shoot. But every single time I do shoot, spindrift is an issue, about 9" worth at 1000 yds.</p></blockquote><p></p>
[QUOTE="Pdvdh, post: 249904, member: 4191"] It's really pretty simple. After confirming your rifle is dead on at 200 to 300 yds, shoot a group on a windless day at 1000 yds. Measure how far the group is to the right of POA. Subtract Coriolis drift and your left with spindrift. If you're 1000 yd group measures 12 or more inches, don't worry about measuring your spindrift, because your outfit isn't fit for 1000 yd shots anyway. But if you shoot a 0.7 moa group or less at 1000 yds and the center of that group is 11-12" right, then subtract Coriolis drift and then you'll have your spindrift. Yes, if it's windy out, the wind will affect the bullet's POI more than spindrift, but [B]are you trying to convince us we should ignore 6-10" spindrift @ 1000 yds because the wind might be blowing? [/B]Would you ignore a known, constant 90 degree 1 mph wind on a 1000 yd shot? That's about what spindrift amounts to. Once you've figured out how much spindrift your rifle/bullet/load combination produces, it's guaranteed to be present on each and every shot. I've spent the time to determine my spindrift, and know that I know how much drift I experience @ 1000 yds, I'd feel pretty foolish ignoring it. We don't all live in wind alley. But even if I did, there's no reason for me not to allow for the 9" of spindrift on each and every shot. In the wind conditions you described, most won't be shooting at anything other than targets at 1000 yds. Your example is along the lines of, "[I]if you're shooting through a tornado, is spindrift really an issue[/I]?" The answer is no, not if I don't shoot. But every single time I do shoot, spindrift is an issue, about 9" worth at 1000 yds. [/QUOTE]
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