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Long Range Competition
Rotational projectile drift
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<blockquote data-quote="BallisticsGuy" data-source="post: 1327145" data-attributes="member: 96226"><p>Keep in mind I'm a target shooter, not a long range hunter anymore so this is from that point of view. Shooting at meat IMHO requires a slightly different approach. So the short answer, generally don't bother but check your spin drift numbers at your planned distance maximum and decide where you're going to cap your range or start adjusting.</p><p></p><p>"Spin Drift" happens. There's a very un-handy equation that makes a really good fist of calculating it which I'm happy to share for those so inclined. </p><p></p><p>In general, I don't bother with correcting for spin drift at all until well after 700m when using drop/drift charts and then it's not really usually a factor of importance for me till after 1000m. If I'm using a gadget then I have spin and coriolis included in the result if that feature exists. There's usually no point correcting for spin until things get really long anyway. It's a very small effect. The slop in the average wind call has much more effect. There's also another induced drift I mention above referred to as "horizontal Coriolis" which is dependent basically on time of flight, velocity and latitude. It's not worth bothering with until >1000m for anything I do. There's a slightly less brutal equation to calculate Coriolis. </p><p></p><p>FWIW, there's also a vertical Coriolis component dependent on time of flight, velocity and heading. It's also pointless to discuss at anything short of 1000m and there's a mostly non-brutal equation to calculate it.</p></blockquote><p></p>
[QUOTE="BallisticsGuy, post: 1327145, member: 96226"] Keep in mind I'm a target shooter, not a long range hunter anymore so this is from that point of view. Shooting at meat IMHO requires a slightly different approach. So the short answer, generally don't bother but check your spin drift numbers at your planned distance maximum and decide where you're going to cap your range or start adjusting. "Spin Drift" happens. There's a very un-handy equation that makes a really good fist of calculating it which I'm happy to share for those so inclined. In general, I don't bother with correcting for spin drift at all until well after 700m when using drop/drift charts and then it's not really usually a factor of importance for me till after 1000m. If I'm using a gadget then I have spin and coriolis included in the result if that feature exists. There's usually no point correcting for spin until things get really long anyway. It's a very small effect. The slop in the average wind call has much more effect. There's also another induced drift I mention above referred to as "horizontal Coriolis" which is dependent basically on time of flight, velocity and latitude. It's not worth bothering with until >1000m for anything I do. There's a slightly less brutal equation to calculate Coriolis. FWIW, there's also a vertical Coriolis component dependent on time of flight, velocity and heading. It's also pointless to discuss at anything short of 1000m and there's a mostly non-brutal equation to calculate it. [/QUOTE]
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Rotational projectile drift
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