I hesitate to get in the middle of this; but I am confused a bit by the difference b/t muzzle velocity and the 'speed of the bullet.' Kinetic energy is equal to 1/2*M*V[squared]. Velocity is weighted more than the mass (of the projectile). All else being equal (like leaving out fragmenting projectiles), isn't the KE the important factor in 'stopping power?' Also, I believe most major police departments train officer to 'shoot to kill.' Some argue it shouldn't be that way; but it's awfully hard to try and disable a violent criminal.