13.2×99mm Hotchkiss Long

The 13.2 × 99 mm Hotchkiss Long (also known as: 13.2 Mle. 1930, 13.2 Breda, 13.2 Japanese, etc), is a heavy machine gun cartridge developed by France during the interwar period for the Hotchkiss 13.2 mm machine gun. It saw major use as a heavy machine gun cartridge from the 1930s throughout WWII by a variety of nations due to the export success of the 13.2 mm Hotchkiss machine gun, but was eventually superseded in popularity by the 12.7 × 99 mm Browning (.50 BMG) after the war and eventually disappeared once the Browning cartridge became NATO standard.

13.2×99mm Hotchkiss Long
From left: 13.2 × 99 mm Hotchkiss Long, 13.2 × 96 mm Hotchkiss Short, 13.2 × 92 mm SR Mauser
TypeMachine gun cartridge
Place of originFrance
Service history
In service1926–1949
Used bySee Users
WarsWorld War II
Production history
DesignerHotchkiss et Cie / Société Française des Munitions
Designed1925
Variants13.2×96mm Hotchkiss Short
Specifications
Bullet diameter13.5 mm (0.53 in)
Neck diameter14.48 mm (0.570 in)
Shoulder diameter18.5 mm (0.73 in)
Base diameter20.2 mm (0.80 in)
Rim diameter20.3 mm (0.80 in)
Rim thickness2 mm (0.079 in)
Case length99.2 mm (3.91 in)
Overall length136.6 mm (5.38 in)
Ballistic performance
Bullet mass/type Velocity Energy
52 g (802 gr) solid 790 m/s (2,600 ft/s) 16,319 J (12,036 ft⋅lbf)
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