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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Drag Function question.
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<blockquote data-quote="Jeff In TX" data-source="post: 32234" data-attributes="member: 1522"><p>TiroFijo,</p><p></p><p>I understand ballistics very well; it's a bit of a hobby and passion of mine. I shoot Sierra's 168 Gr match kings and Hornady's 168 AMAX out of my .308 to a 1000 yards.</p><p></p><p>I also understand that no ballistic program or G? drag model is exact. I've had many talks with the ballistic technicians at the US Army's Aberdeen Proving Grounds. Ballistic is what they do for a living. They utilized the lastest and greatest equipment for measuring ballistic including doppler radar. They will tell you that a G1 drag model is only accurate out to 450 to 600 yards depending on the type of bullet. Beyond that, the G1 model is very inaccurate. Those are very short distances for them to measure. They normally work from 700 yards and beyond and the drag models they've developed are very accurate at the ranges they test </p><p></p><p>Also understand, some ballistic programs are written using a modified G1 drag function to massage the data and utilized multiple BC's at different ranges. My understanding from the Sierra techs I've talked with is Sierra's testing is done in a controlled environment 300-yard indoor tunnel range. Talking with their techs, they don't test their bullets much beyond that. So their G1 drag function will probably work very well at those ranges. I've tried the G1 drag functions for both bullets I shoot. Using the G1 drag function, I'm 31 inches low at 1000 yards to my actual data. That's not close to being accurate, but my RSI ballistic lab has me within 6 inches of my actual data using the G5 drag model. Not perfect, but very accurate. </p><p></p><p>Good discussion though. The info we get the better informed we are.</p><p></p><p>[ 03-07-2004: Message edited by: Jeff In TX ]</p></blockquote><p></p>
[QUOTE="Jeff In TX, post: 32234, member: 1522"] TiroFijo, I understand ballistics very well; it’s a bit of a hobby and passion of mine. I shoot Sierra's 168 Gr match kings and Hornady's 168 AMAX out of my .308 to a 1000 yards. I also understand that no ballistic program or G? drag model is exact. I’ve had many talks with the ballistic technicians at the US Army’s Aberdeen Proving Grounds. Ballistic is what they do for a living. They utilized the lastest and greatest equipment for measuring ballistic including doppler radar. They will tell you that a G1 drag model is only accurate out to 450 to 600 yards depending on the type of bullet. Beyond that, the G1 model is very inaccurate. Those are very short distances for them to measure. They normally work from 700 yards and beyond and the drag models they’ve developed are very accurate at the ranges they test Also understand, some ballistic programs are written using a modified G1 drag function to massage the data and utilized multiple BC’s at different ranges. My understanding from the Sierra techs I've talked with is Sierra's testing is done in a controlled environment 300-yard indoor tunnel range. Talking with their techs, they don't test their bullets much beyond that. So their G1 drag function will probably work very well at those ranges. I've tried the G1 drag functions for both bullets I shoot. Using the G1 drag function, I’m 31 inches low at 1000 yards to my actual data. That’s not close to being accurate, but my RSI ballistic lab has me within 6 inches of my actual data using the G5 drag model. Not perfect, but very accurate. Good discussion though. The info we get the better informed we are. [ 03-07-2004: Message edited by: Jeff In TX ] [/QUOTE]
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