NAME – 12.7x99mm M8 API

NAME (COMMON) – .50 M8 Armor Piercing Incendiary

TYPE – Centerfire

YEAR OF INTRODUCTION – 1943

COUNTRY OF ORIGIN – USA

CASE TYPE – Rimless bottleneck

CARTRIDGE LENGTH – 138.4 mm (5.45 in)

CASING LENGTH – 99.3 mm (3.91 in)

CASE HEAD DIAMETER – 20.42 mm (0.804 in)

CASE RIM DIAMETER – 20.42 mm (0.804 in)

BULLET TYPE – Full jacketed hardened steel core incendiary

BULLET DIAMETER – 12.95 mm (0.510 in)

BULLET WEIGHT – 42.96 g (663 grains)

POWDER WEIGHT – 15.23 g (235 grains)

CASING WEIGHT – 56.12 g (866 grains)

TOTAL ROUND WEIGHT – 114.31 g (1,764 grains)

MUZZLE VELOCITY – 887 m/s (2910 fps)

NOMINAL BARREL LENGTH – 114.3 cm (45 in)

MUZZLE ENERGY – 16,905 j (12,469 ft/lb)

M2 Link – 17.30 g (267 grains)

M9 Link – 16.72 (258 grains)

M15A2 Link – 18.21 g (281 grains)