 The mounts used a common power drive that could train at a rate of 30 degree/second and elevate from 15 degrees to 85 degrees at a rate of 24 degree/second.The cannon was fed automatically from an on-mount magazine which was replenished during action by two loaders on each side of the cannon.With proximity fuze and fire-control radar, a twin 3″/50 mount firing 50 rounds per minute per barrel was considered more effective than a quad Bofors 40 mm gun against subsonic aircraft, but relatively ineffective against supersonic jets and cruise missiles.