.50 BMG
.50 BMG aka .50 Browning Machine Gun is a cartridge invented for the M2 machine gun that is now also used in high powered sniper rifles. Its metric dimensions (and designation) are 12.7×99mm NATO.
A wide variety of ammunition is available including ball, tracer, armor piercing, incendiary and saboted sub-caliber rounds. The availability of match grade ammo has increased the usefulness of .50 caliber sniper rifles by allowing more accurate fire than lower quality rounds. Matching the availability and price of the higher quality .50 ammunition is an impediment to producing large caliber sniper rifles using a different round such as 20mm or another custom size.
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