That is what our guns did. They could be pre-loaded with 20 rounds and fired with no gun crew. The crew was really only there to reload the thing. Nobody is in the turret. My berthing compartment was outboard of the forward gun. The muzzle swung directly over us at times. They'd fire and knock us out of our chairs. A bonus was that it shook all the dirt and dust from the overheard so it made field days easier.
Mk 45 5"/54 caliber gun
Anyone confused by the designation and use of "caliber"? It is used with the bore to determine barrel length. 5x54=270 inches or 22.5 feet long.