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Long Range Hunting & Shooting
extreme spin drift
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<blockquote data-quote="el matador" data-source="post: 1123639" data-attributes="member: 12193"><p>Things that make your bullet go to the right:</p><p></p><p>Coriolis</p><p>Spin drift</p><p>Wind</p><p>Scope reticle not level</p><p>Scope not tracking parallel with reticle</p><p></p><p>Coriolis might add a few inches to your error, depending on which direction you're shooting. Spin drift is around 6" at that range. If you're not using a ballistic calc that compensates for spin drift you could sight in about 1/2 moa to the left. This will offset most of your spin drift out to about 1000 yards. A 5 mph wind will make your bullet drift off course about 18" at that range. Having your scope canted 5 degrees will also give you about 18" of error. My guess is that its a combination of these things. You can check for scope error by doing the "tall target test": <a href="http://www.longrangehunting.com/forums/f17/tall-target-test-video-comments-155589/" target="_blank">http://www.longrangehunting.com/forums/f17/tall-target-test-video-comments-155589/</a></p></blockquote><p></p>
[QUOTE="el matador, post: 1123639, member: 12193"] Things that make your bullet go to the right: Coriolis Spin drift Wind Scope reticle not level Scope not tracking parallel with reticle Coriolis might add a few inches to your error, depending on which direction you're shooting. Spin drift is around 6" at that range. If you're not using a ballistic calc that compensates for spin drift you could sight in about 1/2 moa to the left. This will offset most of your spin drift out to about 1000 yards. A 5 mph wind will make your bullet drift off course about 18" at that range. Having your scope canted 5 degrees will also give you about 18" of error. My guess is that its a combination of these things. You can check for scope error by doing the "tall target test": [URL]http://www.longrangehunting.com/forums/f17/tall-target-test-video-comments-155589/[/URL] [/QUOTE]
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