NAME – 5.6×44 mm XM 144 Flechette

NAME (COMMON) – XM144

TYPE – Centerfire

YEAR OF INTRODUCTION – 1962

COUNTRY OF ORIGIN – USA

CASE TYPE – Rimless, bottlenecked

CARTRIDGE LENGTH – 49.36 mm (1.94 in)

CASING LENGTH – 43.9 mm (1.73 in)

CASE HEAD DIAMETER – 8.40 (0.331 in)

CASE RIM DIAMETER – 8.33 mm (0.328 in)

BULLET TYPE – Finned flechette

BULLET DIAMETER – 1.80 mm (0.071 in)

BULLET LENGTH – 42.4 mm (1.67 in)

BULLET WEIGHT – 0.67 g (10.3 grains)

TOTAL ROUND WEIGHT – 7.02 g (108.4 grains)

MUZZLE VELOCITY – 1,398 m/s (4,585 fps)

NOMINAL BARREL LENGTH – 50.8 cm (20 in)

MUZZLE ENERGY – 352 j (481 ft/lb)