Skip to content
EntityQ171628· pop 32· linked from 1,049 articles

Also known as .50 Browning Machine Gun, 12.7×99mm NATO, 50 Browning, 12.7 x 99 mm

rifle cartridge designed by John Moses Browning

Key facts

Type
Heavy machine gun , Anti-materiel rifle
Place of origin
United States
In service
1921–present
Used by
NATO
Designer
Winchester Repeating Arms Co. and Frankford Arsenal
Case type
Rimless, bottleneck
Bullet diameter
0.511 in (12.98 mm)
Land diameter
0.498 in (12.65 mm)
Neck diameter
0.560 in (14.22 mm)
Shoulder diameter
0.714 in (18.14 mm)
Base diameter
0.804 in (20.42 mm)
Rim diameter
0.804 in (20.42 mm)
Rim thickness
0.089 in (2.26 mm)
Case length
3.910 in (99.31 mm)
Overall length
5.450 in (138.43 mm)
Case capacity
292.80 gr H 2 O (18.973 cm )
Primer type
#35 Arsenal Primer
Maximum pressure tm43 0001 27
54,923 psi (378.68 MPa)

via Wikipedia infobox

~21 min read

Encyclopedic overview

Test barrel length: 45 in (1.1 m) Source: Ammoguide.com

The .50 BMG (.50 Browning Machine Gun), also known as 12.7×99mm NATO, and designated as the 50 Browning by the C.I.P., is a .50 in (12.7 mm) caliber cartridge developed for the M2 Browning heavy machine gun in the late 1910s, entering official service in 1921. Under STANAG 4383, it is a standard service cartridge for NATO forces. The cartridge itself has been made in many variants: multiple generations of regular ball, tracer, armor-piercing (AP), incendiary, and saboted sub-caliber penetrator rounds. The rounds intended for machine guns are made into a continuous ammunition belt using metallic links.

Excerpted from Wikipedia’s “.50 BMG” article, available under the CC BY-SA 4.0 licence.