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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Do you guys dial in for spin drift?
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<blockquote data-quote="justgoto" data-source="post: 503163" data-attributes="member: 17125"><p>I don't see any consideration on bullet type, velocity, or even the direction of twist, (since coriolis can work against it depending on geographic location.) Blanket statements on a specific chambers isn't an accurate gauge. I myself discovered gyroscopic drift at 400 yards, when the 220gr RN would inexplicably hit 3 inches more to the right, than the 180gr SPs in my 30-06. If I would have realized what was going on beforehand, I would have understood the differences in the POIs at 200 and 300 yards weren't errors in doping wind.</p><p></p><p>As I've alluded to earlier; since I don't usually shoot very far; I try to make-up for it by shooting small targets... and one doesn't consistently hit a cold-bore shot at the 400 yard 1/2moa target, using the 180gr SPs traveling at 2560fps, in my 1 in 10 right-hand twist 30-06, in central Ohio; if one doesn't take into account the 1/4moa gyroscopic drift... and one will definitely not hit it with the 220gr RN at 2390fps, without accounting for the 1moa adjustment.</p></blockquote><p></p>
[QUOTE="justgoto, post: 503163, member: 17125"] I don't see any consideration on bullet type, velocity, or even the direction of twist, (since coriolis can work against it depending on geographic location.) Blanket statements on a specific chambers isn't an accurate gauge. I myself discovered gyroscopic drift at 400 yards, when the 220gr RN would inexplicably hit 3 inches more to the right, than the 180gr SPs in my 30-06. If I would have realized what was going on beforehand, I would have understood the differences in the POIs at 200 and 300 yards weren't errors in doping wind. As I've alluded to earlier; since I don't usually shoot very far; I try to make-up for it by shooting small targets... and one doesn't consistently hit a cold-bore shot at the 400 yard 1/2moa target, using the 180gr SPs traveling at 2560fps, in my 1 in 10 right-hand twist 30-06, in central Ohio; if one doesn't take into account the 1/4moa gyroscopic drift... and one will definitely not hit it with the 220gr RN at 2390fps, without accounting for the 1moa adjustment. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Do you guys dial in for spin drift?
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