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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: 249989" data-attributes="member: 4191"><p>My understanding is that spindrift increases at an increasing rate with distance. I offer the following example with fabricated numbers simply to illustrate this. If you see 3" of spindrift at 600 yards, you might experience 8-9" at 1200 yds. Exactly how much more spindrift you'll experience in the 2nd 600 yds compared to the 1st 600 yds the bullet travels will remain unknown until you shoot at that distance on a calm day and then measure the additional right-ward drift. Your suggestion may get you to within a couple inches at 1000 yds, but I don't see how you'll ever really know unless you just wait for a still day and then shoot at the maximum yardages you intend to shoot at game.</p><p></p><p>Additionally, I've never noted enough spindrift at 600 yds over the past 20 years to cause me to question my equipment. Once I stepped back to 1000 yds, it became so obvious I started examining my scope mount systems for flaws. Indeed I found and corrected a problem with the alignment of one scope, which was mounted pointing off to the right on my 7mm Rem Mag. After I corrected that alignment issue and was able to shoot again on a windless day, I learned that between spindrift and Coriolis drift, the gun was still printing about 12.5" to the right at 1000 yds. I was shooting at 60.4 Degrees latitude (Alaska) and Coriolis drift accounted for ~4.5" of the 12.5" of my total measured right-ward drift at that range.</p></blockquote><p></p>
[QUOTE="Pdvdh, post: 249989, member: 4191"] My understanding is that spindrift increases at an increasing rate with distance. I offer the following example with fabricated numbers simply to illustrate this. If you see 3" of spindrift at 600 yards, you might experience 8-9" at 1200 yds. Exactly how much more spindrift you'll experience in the 2nd 600 yds compared to the 1st 600 yds the bullet travels will remain unknown until you shoot at that distance on a calm day and then measure the additional right-ward drift. Your suggestion may get you to within a couple inches at 1000 yds, but I don't see how you'll ever really know unless you just wait for a still day and then shoot at the maximum yardages you intend to shoot at game. Additionally, I've never noted enough spindrift at 600 yds over the past 20 years to cause me to question my equipment. Once I stepped back to 1000 yds, it became so obvious I started examining my scope mount systems for flaws. Indeed I found and corrected a problem with the alignment of one scope, which was mounted pointing off to the right on my 7mm Rem Mag. After I corrected that alignment issue and was able to shoot again on a windless day, I learned that between spindrift and Coriolis drift, the gun was still printing about 12.5" to the right at 1000 yds. I was shooting at 60.4 Degrees latitude (Alaska) and Coriolis drift accounted for ~4.5" of the 12.5" of my total measured right-ward drift at that range. [/QUOTE]
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spin drift
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