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Posted: 12/9/2012 4:48:32 PM EDT
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If your barrel has a 1x8 twist and your bullet is moving at 3000 FPS,
What is the RPM of the bullet? 
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And yet, a 40gr solid lead bullet with 0.012" of gilding metal won't come apart mid-air until about 307,500 RPM. (Source) |
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Quoted:
If your barrel has a 1x8 twist and your bullet is moving at 3000 FPS, What is the RPM of the bullet?
Your question makes the erroneous assumption that as a bullet's forward motion in flight slows, its rotational velocity around its longitudinal axis slows at the same rate. A bullet's forward movement slows much faster than its rotational movement, so its rate of spin is a function of muzzle velocity, twist rate, and the frictional forces slowing its spin. Those frictional forces are much lower than the friction which slows a bullets forward motion. |
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