**Bullet Revolutions Per Minute (rpm)**

A bullet fired from a rifled barrel can spin at over 300,000 rpm, depending on the bullet's muzzle velocity (MV) and the barrel's twist rate.

The general formula for calculating the rpm of a rotating object may be written as

where is the linear velocity of a point in the rotating object (in units of distance/minute) and C refers to the circumference of the circle that this measuring point performs around the axis of rotation.

For a bullet, the specific formula below uses the bullet's MV and the barrel's twist rate to calculate rotational speed:

- MV(in fps) x (12/twist rate in inches) x 60 = Bullet rpm

For example, a bullet with a muzzle velocity of 3050 ft/s fired from a barrel with a twist rate of 1 in 7-inch (180 mm) (*e.g.*, the M16A2 rifle) spins at 313,714 rpm.

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.

Read more about this topic: Rifling, Twist Rate

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