NAME – 12.7×99 mm M1923 Ball

NAME (COMMON) – .50 Browning Model 1923 Ball

TYPE – Metallic Centerfire

YEAR OF INTRODUCTION – 1924

COUNTRY OF ORIGIN – USA

CASE TYPE – Rimless bottleneck

CARTRIDGE LENGTH – 137.7 mm (5.42 in)

CASING LENGTH – 99 mm (3.90 in)

CASE HEAD DIAMETER – 20.42 mm (0.804 in)

CASE RIM DIAMETER – 20.42 mm (0.804 in)

BULLET TYPE – Mild steel-cored full jacketed Ball

BULLET DIAMETER – 12.95 mm (0.510 in)

BULLET WEIGHT – 51.26 g (791 grains)

POWDER WEIGHT – 15.55 g (240 grains)

CASING WEIGHT – 54.63 g (843 grains)

TOTAL ROUND WEIGHT – 121.43 g (1874 grains)

MUZZLE VELOCITY – 777 m/s (2550 fps)

NOMINAL BARREL LENGTH – 91.4 cm (36 in)

MUZZLE ENERGY – 15,840 j (11,683 ft/lb)

     This loading utilized a case designed in 1919 that was used for most of the .50 loads through the end of World War II.

WEIGHT OF M7 110-rd Fabric Ammunition Belt – 0.20 kg (7 oz) EMPTY