We used to run a firing equation called "Quickdraw".
When operating as part of a squadron or TG, we would receive orders from the flagship to fire 5 rounds on a specific bearing in less than one minute. Normally we would have the rounds stowed in the mount itself for this exercise. The gun crew for this exercise was made up entirely of the Gunners from Fox Div. All 5 of us would run to the mount, light off the equipment, train out on bearing, elevate and fire the rounds. Was kinda neat seeing the Chief huff and puff his way thru the passageways to get to the mount.
Those mounts could and often were fired with less than a full complement of crew. But the gunners paid the price over the next couple of days.