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Rifles, Reloading, Optics, Equipment
Reloading
Bullet stability
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<blockquote data-quote="just_jon" data-source="post: 2823841" data-attributes="member: 112153"><p>Check out Berger's stability calculator. For example: 7mm 180 Hybrid Target requires a 1:9 or faster twist. Using data from my 280AI (2975 fps, 60F and 800' elevation), a 1:9.25 twist is marginally stable at 1.45. To increase stability to 1.5 and achieve max BC requires an increase to 3290 fps. A factor of 1.45 decreases BC by 2%, thus the concern with terminal performance.</p></blockquote><p></p>
[QUOTE="just_jon, post: 2823841, member: 112153"] Check out Berger’s stability calculator. For example: 7mm 180 Hybrid Target requires a 1:9 or faster twist. Using data from my 280AI (2975 fps, 60F and 800‘ elevation), a 1:9.25 twist is marginally stable at 1.45. To increase stability to 1.5 and achieve max BC requires an increase to 3290 fps. A factor of 1.45 decreases BC by 2%, thus the concern with terminal performance. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Bullet stability
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