Which item is NOT typically included in a standard ammunition case?

A standard ammunition case is designed to hold all the necessary components for a functioning round of ammunition. This typically includes the base, which provides the necessary structure for firing and houses the primer; the projectile, which is the actual bullet that is shot from the firearm; and gunpowder, which serves as the propellant that creates the explosive force needed to propel the projectile.

The barrel, however, is an integral part of the firearm itself and not part of the ammunition. It provides the channel through which the projectile travels when the gun is fired but is not included in a standard ammunition case. The distinction is key in understanding the relationship between the firearm and its ammunition in terms of their functions and components.