You can find 8 forms of ammunition issued to be used from the M2 Browning .50 caliber machine gun, with the guidelines of the assorted rounds color-coded to point their kind; these consist of: Not like earlier guns, which had to be manually loaded and fired, with this particular machine, https://machguns.com/product/colt-1919-bar-30-06-automatic-machine-rifle-transferable/