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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Bullet rotation vs velocity
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<blockquote data-quote="Varminator 911" data-source="post: 220795" data-attributes="member: 9705"><p>jwp475:</p><p> </p><p>You need to read the discussion AJ posted. Because the forward speed decays much faster than the spin, as the bullet travels away from the muzzle, the bullet will spin increasingly faster than 1 revolution per 10 inches. The rpm stays nearly unchanged while the forward speed rapidly decreases.</p><p> </p><p>Pretty simple really, but not important.</p><p> </p><p>With regards to bullet testing, it is important that the necessary spin be imparted at the muzzle. Spin is a combination of twist and muzzle velocity. You need an adequate mix of both to stabilize the bullet. The bullet remains stable downrange because the rpm remain virtually unchanged as the velocity decreases.</p></blockquote><p></p>
[QUOTE="Varminator 911, post: 220795, member: 9705"] jwp475: You need to read the discussion AJ posted. Because the forward speed decays much faster than the spin, as the bullet travels away from the muzzle, the bullet will spin increasingly faster than 1 revolution per 10 inches. The rpm stays nearly unchanged while the forward speed rapidly decreases. Pretty simple really, but not important. With regards to bullet testing, it is important that the necessary spin be imparted at the muzzle. Spin is a combination of twist and muzzle velocity. You need an adequate mix of both to stabilize the bullet. The bullet remains stable downrange because the rpm remain virtually unchanged as the velocity decreases. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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Bullet rotation vs velocity
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