In service, the quad turrets proved to be less reliable than was hoped for. Wartime haste in building, insufficient clearance between the rotating and fixed structure of the turret, insufficient full calibre firing exercises and extensive arrangements to prevent flash from reaching the magazines made it mechanically complex, leading to problems during prolonged actions. In order to bring ammunition into the turret at any degree of train, the design included a transfer ring between the magazine and turret; this did not have sufficient clearance to allow for the ship bending and flexing. Improved clearances, improved mechanical linkages, and better training led to greater reliability in the quadruple turrets but they remained controversial.