The Evolution Of The Rifle

MV x (12/twist rate in inches) x 60 = Bullet RPM
Example using a barrel that has a twist rate of 1 turn in 8" with a muzzle velocity of 3000 ft/s:
3000 x (12/8) x 60 = 270,000
Excessive rotational speed can exceed the bullet's designed limits and the resulting centrifugal force can cause the bullet to disintegrate in a radial fashion.