The Armor Piercing Tracer (APT) cartridge for the 12.7 x 108 caliber is designed for dual functionality. It is capable of penetrating light armor while providing a visible tracer during its trajectory, assisting with aiming and fire adjustment. This round is ideal for both anti-materiel purposes and target designation, making it useful in situations where precise target tracking is crucial. The combination of armor-piercing and tracer properties ensures that the shooter can see the bullet's path, even at long distances, while effectively engaging lightly-armored vehicles and fortifications.