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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Bullet Stability?
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<blockquote data-quote="BallisticsGuy" data-source="post: 1314392" data-attributes="member: 96226"><p>^^^ that. spin rate (ignoring distance covered, so spin, not twist I gues) doesn't drop much at all. Not much friction there. If you consider distance covered with bullet rotation then like the man said, things actually tighten up on the long end even though the rotational rate changes only slightly. Like a coarse thread versus a fine thread being cut on a lathe. Pitch is determined by the speed of the rotation of the shank (the thing being threaded) and the speed that the cutter is pulled down the length of the shank.</p><p></p><p>FWIW, 1.3Sg is what I'd consider marginally stable. In my experience I get more predictable transonic zone performance with calculated Sg's around 1.3-1.4 but you lose BC by a tiny bit. Getting around 1.5 seems according to Berger to be where you're getting your full advertised ballistic coefficeint. I'm assuming this is due to the minimized yaw precession that comes with full gyroscopic stability.</p></blockquote><p></p>
[QUOTE="BallisticsGuy, post: 1314392, member: 96226"] ^^^ that. spin rate (ignoring distance covered, so spin, not twist I gues) doesn't drop much at all. Not much friction there. If you consider distance covered with bullet rotation then like the man said, things actually tighten up on the long end even though the rotational rate changes only slightly. Like a coarse thread versus a fine thread being cut on a lathe. Pitch is determined by the speed of the rotation of the shank (the thing being threaded) and the speed that the cutter is pulled down the length of the shank. FWIW, 1.3Sg is what I'd consider marginally stable. In my experience I get more predictable transonic zone performance with calculated Sg's around 1.3-1.4 but you lose BC by a tiny bit. Getting around 1.5 seems according to Berger to be where you're getting your full advertised ballistic coefficeint. I'm assuming this is due to the minimized yaw precession that comes with full gyroscopic stability. [/QUOTE]
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Rifles, Bullets, Barrels & Ballistics
Bullet Stability?
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