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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
SPIN DRIFT!....I'm such a dummy
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<blockquote data-quote="paphil" data-source="post: 464913" data-attributes="member: 17745"><p>Spin drift is something that really needs to be addressed in long range shooting. I don't consider myself to be any kind of expert but I did kill about 500 groundhogs here in Pa. this past year , most from 500 to 800 yards and only one at 1000 yards. Ignoring spin drift is a sure miss at longer ranges on small targets. A very useful piece of information on spin drift is pointed out by John Porter in the dope the wind vidio. The drift is right or left depending on the twist of the barrel but also up or down depending on the wind direction! It is about a 3-3 1/2 to1 ratio. So on a right twist barrel with a left to right wind with a hold value of 3 minutes, the impact at 1k will be 4 min right and about 1 1/3 min low. (3 min wind + 1 min spin) On the other side, with a 3 min right to left wind, the POI will be 2 min left and about 3/4 min high. I got pretty good at reading the wind but couldn't figure out the high and low misses untill I saw the vidio. I'm shooting a 22-243 with a 1in8 twist Hart barrel and have shot 3 shot groups at 300 yards that measure less than 1/2 inch . I've heard that stupidity is repeatedly doing the same thing and hoping for different results and that is what I do when I expect to hit that cold bore target and don't take into consideration all the variables. I'll find out this summer when I add in the additional inputs. This 10:00 / 4:00 slope with the wind is built in on the new Huskamaw reticles.</p></blockquote><p></p>
[QUOTE="paphil, post: 464913, member: 17745"] Spin drift is something that really needs to be addressed in long range shooting. I don't consider myself to be any kind of expert but I did kill about 500 groundhogs here in Pa. this past year , most from 500 to 800 yards and only one at 1000 yards. Ignoring spin drift is a sure miss at longer ranges on small targets. A very useful piece of information on spin drift is pointed out by John Porter in the dope the wind vidio. The drift is right or left depending on the twist of the barrel but also up or down depending on the wind direction! It is about a 3-3 1/2 to1 ratio. So on a right twist barrel with a left to right wind with a hold value of 3 minutes, the impact at 1k will be 4 min right and about 1 1/3 min low. (3 min wind + 1 min spin) On the other side, with a 3 min right to left wind, the POI will be 2 min left and about 3/4 min high. I got pretty good at reading the wind but couldn't figure out the high and low misses untill I saw the vidio. I'm shooting a 22-243 with a 1in8 twist Hart barrel and have shot 3 shot groups at 300 yards that measure less than 1/2 inch . I've heard that stupidity is repeatedly doing the same thing and hoping for different results and that is what I do when I expect to hit that cold bore target and don't take into consideration all the variables. I'll find out this summer when I add in the additional inputs. This 10:00 / 4:00 slope with the wind is built in on the new Huskamaw reticles. [/QUOTE]
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SPIN DRIFT!....I'm such a dummy
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