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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
bullet stability
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<blockquote data-quote="BryanLitz" data-source="post: 1071562" data-attributes="member: 7848"><p>Paul,</p><p></p><p>Even if not fully stabilized, I still think the 215 Hybrid is a great option for your application. Having said that, there's a good chance your 1:10.75" twist barrel will fully stabilize the bullet if your altitude is high enough. </p><p></p><p>Ideally you want SG (stability factor) to be 1.5+ to get all the BC from the bullet. However, if SG is lower than 1.5, you'll still have good precision and accuracy, just a compromised BC; about 3% per 0.1 of SG.</p><p></p><p>At sea level, your SG will be roughly 1.25, and your BC about 7% lower than it can be. At 3000 feet ASL, your SG will be about 1.4; almost fully stable and BC about 3% lower than it can be. At around 4500 feet altitude, your SG reaches 1.5 and BC is maximized.</p><p></p><p>It's very common for SG's to be under 1.5 especially with modern long bullets so it's not a real big deal to worry about.</p><p></p><p>My suggestion is to work up a good load with the 215's at 100 yards. Then take it out to long range and practice ranging, calculating drop, and shooting at many targets. This will build the skills you need and will tell you if you need to look for another bullet or not.</p><p></p><p>Good luck,</p><p>-Bryan</p></blockquote><p></p>
[QUOTE="BryanLitz, post: 1071562, member: 7848"] Paul, Even if not fully stabilized, I still think the 215 Hybrid is a great option for your application. Having said that, there's a good chance your 1:10.75" twist barrel will fully stabilize the bullet if your altitude is high enough. Ideally you want SG (stability factor) to be 1.5+ to get all the BC from the bullet. However, if SG is lower than 1.5, you'll still have good precision and accuracy, just a compromised BC; about 3% per 0.1 of SG. At sea level, your SG will be roughly 1.25, and your BC about 7% lower than it can be. At 3000 feet ASL, your SG will be about 1.4; almost fully stable and BC about 3% lower than it can be. At around 4500 feet altitude, your SG reaches 1.5 and BC is maximized. It's very common for SG's to be under 1.5 especially with modern long bullets so it's not a real big deal to worry about. My suggestion is to work up a good load with the 215's at 100 yards. Then take it out to long range and practice ranging, calculating drop, and shooting at many targets. This will build the skills you need and will tell you if you need to look for another bullet or not. Good luck, -Bryan [/QUOTE]
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bullet stability
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