Ballistic coefficient
In ballistics, the ballistic coefficient (BC) of a bullet is a measure of its ability to overcome air resistance in flight. A high BC means the object will slow down less. It will have more of its speed left when it reaches the target. BC depends on mass, diameter, and drag coefficient. Ballistic coefficient has units of lb/in² or kg/m². BCs for bullets are normally stated in lb/in² by their manufacturers without referring to this unit. The values for BC can be as low as 0.12 and as high as 1.00 for commonly used bullets.