BARREL TWIST CALCULATOR
Optimum barrel twist results for the given bullet shape
and Stability Factors for a barrel twist of 14 inches

Twist in inches as a function of Muzzle Velocity for a Stability Factor of 1.5

Bullet diameter (inches) .257
Bullet length (inches) .860
Nose length (inches) .360
Meplat diameter (inches) .130
Base diameter (inches) .257
Boat-tail angle (degrees) 0
Boat-tail length (inches)
Barrel twist (inches) 14
Secant nose radius (calibres) 0
Specific Gravity (gms/cc.) 11.4
Air temperature (Fahrenheit) 70
Relative humidity (percent) 35
Estimated Atmospheric Pressure (in. Hg) 28.94
Barometric Pressure (in. Hg) 29.92
Altitude of range (feet) 900

Stability Factor as a function of Muzzle Velocity for a twist of 14 inches

Version: 1.1: Programmed in Perl script by Geoffrey Kolbe