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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Nosler LR Accubonds: BC testing results
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<blockquote data-quote="BryanLitz" data-source="post: 967807" data-attributes="member: 7848"><p>JD338,</p><p>Thanks for posting Noslers recommended twist chart, I couldn't find this when I looked on their site. IMO, it's very important information for those interested in the LR AB's.</p><p></p><p></p><p></p><p>The relationship between twist rate (stability) and BC is true for all bullets. Since this post was about Noslers LRAB's, and those bullets have marginal stability in conventional twist rates, it was a good place to discuss it.</p><p></p><p>But all bullets are like this. You might be able to shoot a 210 VLD out of a 1:12" with good precision (groups), and be leaving some BC on the table. But if you spin it fast enough to produce an SG of 1.5+ in your environment, then you'll be maximizing BC for that bullet thru supersonic flight.</p><p></p><p>When the bullet slows to transonic (below approx 1340 fps) there might be further advantage to spinning even faster and achieving SG's even higher than 1.5. In other words, super-stability has been shown to reduce drag thru transonic, but this is a bullet-by-bullet case. Some bullets are very sensitive to stability thru transonic and others are much less so. The rule about improving BC thru supersonic flight up to SG of 1.5 seems to be universal though.</p><p></p><p>All of these tests are published in the new book, it's really quite interesting. In the coming months, we'll be updating Applied Ballistics software (Kestrels, smartphone apps, etc) to model these known stability effects, as well as pushing improvements to stability calculators so they provide information about BC as well.</p><p></p><p>Stay tuned,</p><p>-Bryan</p></blockquote><p></p>
[QUOTE="BryanLitz, post: 967807, member: 7848"] JD338, Thanks for posting Noslers recommended twist chart, I couldn't find this when I looked on their site. IMO, it's very important information for those interested in the LR AB's. The relationship between twist rate (stability) and BC is true for all bullets. Since this post was about Noslers LRAB's, and those bullets have marginal stability in conventional twist rates, it was a good place to discuss it. But all bullets are like this. You might be able to shoot a 210 VLD out of a 1:12" with good precision (groups), and be leaving some BC on the table. But if you spin it fast enough to produce an SG of 1.5+ in your environment, then you'll be maximizing BC for that bullet thru supersonic flight. When the bullet slows to transonic (below approx 1340 fps) there might be further advantage to spinning even faster and achieving SG's even higher than 1.5. In other words, super-stability has been shown to reduce drag thru transonic, but this is a bullet-by-bullet case. Some bullets are very sensitive to stability thru transonic and others are much less so. The rule about improving BC thru supersonic flight up to SG of 1.5 seems to be universal though. All of these tests are published in the new book, it's really quite interesting. In the coming months, we'll be updating Applied Ballistics software (Kestrels, smartphone apps, etc) to model these known stability effects, as well as pushing improvements to stability calculators so they provide information about BC as well. Stay tuned, -Bryan [/QUOTE]
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Nosler LR Accubonds: BC testing results
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