Bullet RPM Calculator

Summary

Bullet spin rates greater than 290,000 and above are in danger of being ripped apart or severely deformed by excessive heat and friction. In addition, polymer tipped ammunition can deform and show signs of increased drag by heat alone, which can rise with increased spin rates.

Formula

RPM=(Velocity x 720)/Twist

Bullet RPM

Resources

Berger Stability Calculator
Hornady Bullet Temperature White Paper
NIH Bullet Temperature Research