Knockdown Calculator

Here's my pass at a performance predictor for non-expanding handgun bullets.   The Knockdown Coefficient is energy in foot pounds multiplied by projectile cross-sectional area in square inches, multiplied by a factor that takes bullet shape into account.   This factor is based on the average ballistic coefficient for the selected bullet profile.

The result is normalized so that standard Nato M882 9mm Ball ammo = 100%.