The highest caliber machine gun in standard use is the .50 Cal.
Gatling guns are used in 20mm caliber.
XXXXXXXXX
Russia and China use a heavy machine gun larger than the .50 cal BMG- it is the Vladmirov KDV (for the Russians), in caliber 14.5mm x 115.
45 caliber Machine Gun and 50 caliber machine gun
a .45 caliber.
.857
50. caliber machine gun....period
a .45 caliber.
Phosphating
9x19mm
See link below to the US Army Field Manual on the Caliber .50 M2 Machine Gun.
Rifles: Lowest caliber = .357, highest caliber = .44mag Pistols: Lowest caliber = .38, highest caliber = .454mag or a .50AE
50 caliber for US forces
Yes. and just a correction the Thompson is not a machine gun its a sub machine gun because it shoots pistol caliber rounds get your facts straight
1000