BARREL TWIST CALCULATOR
Optimum barrel twist results for the given bullet shape
and Stability Factors for a barrel twist of 450 mm.

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

Bullet diameter (mm.) 5.5
Bullet length (mm.) 8.2
Nose length (mm.) 5
Meplat diameter (mm.) 2.5
Base diameter (mm.) 5.5
Boat-tail angle (degrees) 0
Boat-tail length (mm.)
Barrel twist (mm.) 450
Secant nose radius (calibres) 1
Specific Gravity (gms/cc.) 11.2
Air temperature (Fahrenheit) 59
Relative humidity (percent) 0
Atmospheric Pressure (in. Hg) 29.92
Barometric Pressure (in. Hg) 29.92
Altitude of range (feet) 0

Stability Factor as a function of Muzzle Velocity for a twist of 450 millimetres

Version: 1.1: Programmed in Perl script by Geoffrey Kolbe