What does EFC stand for in the context of the M777A2?

In the context of the M777A2 Howitzer, EFC stands for Equivalent Full Charge. This term is significant as it refers to the quantity of propellant that produces a projectile muzzle velocity equivalent to what would be achieved using a standard full charge of propellant for the particular projectile and howitzer configuration. Knowing the EFC is crucial for achieving desired ballistic performance and ensuring the accuracy and effectiveness of fire missions. It helps gunners determine the correct propellant charge to use for achieving optimal range and impact for different types of munitions fired from the M777A2. The concept of Equivalent Full Charge ensures that there is a consistent reference point for achieving performance across various scenarios and different projectile types.