The guns had a very low rate of fire, as the following quote suggests:
“At target practice in 1887 four rounds fired from one gun in 6 minutes (and scoring 3 hits at 1,500 yards).” And even this must been under ideal conditions, as later documentation (Gunnery Manual 1900) quotes a firing rate of one round every 3 minutes.
This section looks at the reloading cycle of the port turret. The first picture shows that both turrets could be fired on a broadside. However, the reloading mechanism required that the guns be trained on the beam (starboard turret to Green 90, port turret to Red 85), run in to their recoiled position and elevated to the maximum angle (13 degrees) to line up with the hydraulic loading rams.
Firing at a target on the starboard beam meant that the port turret had to be slowly trained back over to the port beam for reloading. The starboard turret does not have so far to travel. Training speed would be about 360 degrees in one minute, adding a full minute to the reload time for the offside turret.