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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="Tumbleweed" data-source="post: 553044" data-attributes="member: 9281"><p>Speaking of spin drift I've got kind of a strange one for you. As mentioned above in an earlier post I have my spin drift corrected at distance so that I will be slightly left at the closer ranges. With all of this talk of spin drift I re-checked my own spin drift correction at 1050 meters. I shot at first light with a maximum of 1/4 to 1/2 mile per hour winds. I had a flag on the target, at 750 meters and at 500 meters that I could watch before letting the shots go. All flags were down when I shot my 3 shot group that was 9 and 9/16". The group is still centered horizontally at this distance which is what I fully expected. The next morning I decided to shoot at around 740 meters in the same no wind conditions. Same thing, all flags down and shot 2 side by side that measured 1 and 1/2" apart. The thing is that the pair is 1.25MOA left of the bull. So, at 100 meters I am .5MOA left, 740 meters I am 1.25MOA left and at 1050 meters I am centered. This suggests to me that at least in my rifle that the spin drift seems to be an "arc" rather than a straight line value with the most drift taking place in the last 300 or so meters. In other words; if I'm .5MOA left at 100 to be centered and corrected at 1050, in theory I should be no more than .5 MOA left any distance between 100 and 1050. In fact the closer to 1050 the more right my point of impact should be moving correct?</p></blockquote><p></p>
[QUOTE="Tumbleweed, post: 553044, member: 9281"] Speaking of spin drift I've got kind of a strange one for you. As mentioned above in an earlier post I have my spin drift corrected at distance so that I will be slightly left at the closer ranges. With all of this talk of spin drift I re-checked my own spin drift correction at 1050 meters. I shot at first light with a maximum of 1/4 to 1/2 mile per hour winds. I had a flag on the target, at 750 meters and at 500 meters that I could watch before letting the shots go. All flags were down when I shot my 3 shot group that was 9 and 9/16". The group is still centered horizontally at this distance which is what I fully expected. The next morning I decided to shoot at around 740 meters in the same no wind conditions. Same thing, all flags down and shot 2 side by side that measured 1 and 1/2" apart. The thing is that the pair is 1.25MOA left of the bull. So, at 100 meters I am .5MOA left, 740 meters I am 1.25MOA left and at 1050 meters I am centered. This suggests to me that at least in my rifle that the spin drift seems to be an "arc" rather than a straight line value with the most drift taking place in the last 300 or so meters. In other words; if I'm .5MOA left at 100 to be centered and corrected at 1050, in theory I should be no more than .5 MOA left any distance between 100 and 1050. In fact the closer to 1050 the more right my point of impact should be moving correct? [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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SPIN DRIFT!....I'm such a dummy
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