NAME – 40x46mm M397/M397A1 High Explosive

NAME (COMMON) – M397/M397A1 HE “Jump-Up”

CALIBER – 40x46mmSR

TYPE – Low velocity, ground impact, air burst, high explosive, fragmentation

YEAR OF INTRODUCTION – 1964

COUNTRY OF ORIGIN – USA

IDENTIFYING COLOR CODE – Green cartridge case with yellow ink markings, Olive drab projectile body with yellow ink markings, Gold round-nosed ogive

CASE TYPE – M118 Semi-rimmed straight walled

CARTRIDGE LENGTH – 10.28 cm (4.05 in)

CASING LENGTH – 46mm (1.811 in)

CASE HEAD DIAMETER – 41.097 mm (1.618 in)

CASE RIM DIAMETER – 43.54 mm (1.714 in)

PROJECTILE TYPE – Flat-nosed aluminum-bodied projectile with separation charge and metal fragmentation body

PROJECTILE DIAMETER – 41.15 mm (1.620 in) at rotating band

PROJECTILE WEIGHT (M397) – 0.180 kg (6.35 oz)

PROJECTILE WEIGHT (M397A1) – 0.181 kg (6.38 oz)

POWDER WEIGHT – 0.33 g (5.09 grains) M9 double-base flake mortar powder

FILLER – Octol

FILLER WEIGHT – 0.032 kg (1.13 oz)

FUZE TYPE (M397) – M536 with 120 millisecond auxiliary delay

FUZE TYPE (M397A1) – M576E1 with 80 millisecond auxiliary delay

CASING WEIGHT – 0.050 kg (1.78 oz)

TOTAL ROUND WEIGHT (M397) – 0.230 kg (8.11 oz)

TOTAL ROUND WEIGHT (M397A1) – 0.231 kg (8.16 oz)

MUZZLE VELOCITY – 75 m/s (247 fps)

NOMINAL BARREL LENGTH – 35.6 cm (14 in)

MINIMUM (ARMING) RANGE – 14 to 27 m (45 to 90 feet)

MAXIMUM RANGE – 400 m (437 yards)

EFFECT – Ejection of fragmentation body at point of impact to 1.52 m (5 foot) altitude. Blast and fragmentation after secondary (auxiliary) fuze delay

AREA OF EFFECT – 5 m (5.5 yards) burst radius

MANUFACTURER –

STATUS – Obsolescent

SERVICE – US Military