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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Spin drift
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<blockquote data-quote="Rifleman 7" data-source="post: 26950" data-attributes="member: 1268"><p>"Understanding Firearm Ballistics" by Robert A. Rinker: Chapter 9 - Spin-Gyroscopic Drift.</p><p></p><p>Spin drift is defined by Military Ordinance as, "The lateral deviation of the trajectory from the plane of depature caused by rotation of the projectile." Bullets drift to the right when fired from a right twist barrel and to the left from a left twist barrel. ...it increases at the longer ranges and forms a slightly decreasing radius curve.</p><p></p><p>There is no practical method of calculating drift from factors such as velocity, range, etc. Various bullet characteristics that cannot accurately be predicted are involved. Consequently, a direct measurement during testing is the only certain method of determining drift.</p></blockquote><p></p>
[QUOTE="Rifleman 7, post: 26950, member: 1268"] "Understanding Firearm Ballistics" by Robert A. Rinker: Chapter 9 - Spin-Gyroscopic Drift. Spin drift is defined by Military Ordinance as, "The lateral deviation of the trajectory from the plane of depature caused by rotation of the projectile." Bullets drift to the right when fired from a right twist barrel and to the left from a left twist barrel. ...it increases at the longer ranges and forms a slightly decreasing radius curve. There is no practical method of calculating drift from factors such as velocity, range, etc. Various bullet characteristics that cannot accurately be predicted are involved. Consequently, a direct measurement during testing is the only certain method of determining drift. [/QUOTE]
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Spin drift
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