Miller Stability and Spin Drift

The Miller Stability factor is an indication of how stable a bullet will remain in flight.  A minimum value of 1.5 ensures that a bullet will remain stable across most temperatures and atmospheric variations.  The stability factor is also used to calculate spin drift. 

If you wish to calculate spin drift, the time of flight must be entered.  Bullets drift right with clock-wise twist, and to the left with counter clock-wise twist.  The equation to calculate spin drift is:

Spin Drift (inches) = 1.25*(Miller Stability Factor + 1.2)*tof^1.83    *

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Default values for the calculation are shown below.
Change any or all of the input variables for your particular bullet.