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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: 250161" data-attributes="member: 4191"><p>That's precisely what I did also. I first zeroed dead on at 990 yds on windless days. Then I came back and shot at 300 yds and measure the leftward impact at 300. From there I could calculate the total left to right drift from 300 to 990 yds. Then I subtracted Coriolis drift from my total drift to determine spindrift. You could also shoot at 100 yds or 200 yds, and those might be better yardages. I used 300 yds because that's where I shoot to check my rifles zero prior to heading out hunting and I wanted to know the left dope required at that yardage to be dead on at 1000 yds.</p></blockquote><p></p>
[QUOTE="Pdvdh, post: 250161, member: 4191"] That's precisely what I did also. I first zeroed dead on at 990 yds on windless days. Then I came back and shot at 300 yds and measure the leftward impact at 300. From there I could calculate the total left to right drift from 300 to 990 yds. Then I subtracted Coriolis drift from my total drift to determine spindrift. You could also shoot at 100 yds or 200 yds, and those might be better yardages. I used 300 yds because that's where I shoot to check my rifles zero prior to heading out hunting and I wanted to know the left dope required at that yardage to be dead on at 1000 yds. [/QUOTE]
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