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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Ballistics Software - How Far Will It Go?
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<blockquote data-quote="LouBoyd" data-source="post: 261497" data-attributes="member: 9253"><p>Ballistic calculators can't determine whether a bullet will be stable when it goes transonic unless it has information abouit what the spin rate rate is as it goes transsonic. The spin rate at the muzzle is easily calculated from the mzzle velocity and the barrel twist, but there is no published coefficient iv'e seen to determine the rate at which a given bullet loses itfs rate of spin with time or distance. I'd expect that rate wold be related to forward drag, but I don't know what the realtionship is. Do any of you know of a study of the downrange spin rate of specific bullets?</p></blockquote><p></p>
[QUOTE="LouBoyd, post: 261497, member: 9253"] Ballistic calculators can't determine whether a bullet will be stable when it goes transonic unless it has information abouit what the spin rate rate is as it goes transsonic. The spin rate at the muzzle is easily calculated from the mzzle velocity and the barrel twist, but there is no published coefficient iv'e seen to determine the rate at which a given bullet loses itfs rate of spin with time or distance. I'd expect that rate wold be related to forward drag, but I don't know what the realtionship is. Do any of you know of a study of the downrange spin rate of specific bullets? [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Ballistics Software - How Far Will It Go?
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