They also were much slower firing than their American counterparts. Part of it was their training, fire drill, etc. Each crewman had his specific duty - fine, makes sense but after each man did what they were supposed to do they then were expected to go stand at their original position when gun drill commenced. Only then would the next guy do his bit and then when he was back in his spot, the third guy.
Most artillery crews want to be firing as fast as feasible, this sort of drill did not help.