50 BMG or 50 Browning Machine Gun
Military Cartridge Section
Right side picture for size comparison
Left 50 BMG right .223Rem or 5.6 NATO
This is one of the most successful military cartridges of all time. This cartridge was invented in 1918 by John Browning,
the .50 BMG, also known as the  50 Browning for the 50 Browning Machine Gun. Also known as the 12.7x99mm in
Europe, has been used extensively in almost every U.S.A. conflict since its adoption in 1923.
Adopted by the U.S. Military in 1923 the .50 BMG has been used longer than any other cartridge in military history.  (Note:
The .45 ACP  is actually older, but was technically superseded.) Technically the .50 BMG is the biggest cartridge available
to shooters without encumbrance legal restrictions. (There are other wider diameter cartridges, but none larger available)