 The shells alone weighed about 13 pounds including an explosive bursting charge of 0.81 pounds for anti-aircraft (AA) rounds or 1.27 pounds for High Capacity (HC) rounds, the remainder of the weight being the steel casing.Maximum range was 14,600 yards at 45 degrees elevation and ceiling was at 85 degrees elevation.Useful life expectancy was 4300 effective full charges (EFC) per barrel.