RPM formula

[daveosok]

What is the formula for caluculating RPM for a certain twist and velocity?

 

[CatShooter]

Divide the number 12 by the twist in inches, take that answer, and multiply by the muzzle velocity (fps), and multiply by 60.

The answer is in "RPM"

CatShooter.

 

[daveosok]

Thanks Cat