Here are weights as given in a WW II era manual. Sorry but no weight for the links are given.
Per OS 9-18, November 1942, .50 cal. cartridge weights (approximate), in grains
A.P., M2: 1822
A.P., M1: 1869
Ball, M2: 1813
Ball, M1: 1873 (cartridge is limited standard and no longer...