The 50 Browning was developed by John M. Browning in 1921. The 50 Browning was designed for the new heavy machinegun adopted by the U.S. Army in 1923. Today many bullets types are made for this calibre, including ball, armour-piercing, tracer, incendiary, sabot hyper-velocity and others. Recently, long-range target rifles from McMillan, Barret and others have chambered this round. It has thus moved down from exclusive use in heavy machineguns. The Fifty Caliber Shooters Association (FSCA) holds 1000-yard (and longer) competitive events. In modern rifles, five-shot groups at 1000-yards often fall within 6-inch circle, and many groups under 3 inches have been recorded. 

This text is based on information from “Cartridges of the World”, Hodgdon reloading manual, the cartridge designer and/or own resources.