Ammunition 37x145mmR_M4

1 ammunition

1.1 high-explosive tracer shell, 37 mm, m54 standard
1.2 practice shell, 37 mm, m55a1 standard
1.3 armor-piercing shot, 37 mm, m80 standard

ammunition

ammunition issued in form of fixed rounds, consisting of:

h.e.t. shell, m54, point-detonating fuze, m56
practice shell, m55a1, dummy fuze, m50
a.p. shot, m80.

high-explosive tracer shell, 37 mm, m54 standard

this shell used m56 point detonating fuze. complete round weighs 1.99 lb (900 g); fired, projectile weighs 1.34 lb (608 g). 0.16 lb (70 g) charge of m2 powder hercules ng formula of single perforated grains 0.030 in (0.76 mm) web , gives projectile prescribed muzzle velocity of 2,000 ft/s (610 m/s).

the m54 used shell-destroying tracer in addition point-detonating fuze. tracer had burning time of 3 seconds @ end of set off igniting relay charge of 1.68 gr (0.109 g) of grade a-5 army black powder ignited relay pellet detonated charge, destroying shell before ground impact.

the bursting charge of tetryl weighed 0.10 lb (45 g), , alternate composition charge weighs 0.105 lb (48 g). tetryl loading consisted of 200 gr (13 g) tetryl pellet pressed shell cavity under 9,000-10,000 psi (60-70 mpa) pressure , remainder of charge of 2 equal increments pressed under approximately 9,000 psi (60 mpa) pressure. composition bursting charge loaded in same manner tetryl charge, except relay pellet composition weighs 36 gr (2.3 g) against 23 gr (1.5 g) pellet used tetryl load.

practice shell, 37 mm, m55a1 standard

this shell high-explosive shell modified practice purposes. contained red tracer , dummy fuze (m50, m50b1, m50b2 or m50b3). m50 dummy fuze made plastic composition , m50b1, m50b2 , m50b3 fuzes made low carbon steel machined give same contour , weight point-detonating fuze, m56, used m54 projectile.

as used in m4, complete round weighed 1.99 lb (900 g), , fired shell weighed 1.34 lb (610 g). 0.16 lb (70 g) charge of m2 powder hercules ng formula of single perforated grains 0.030 in (0.76 mm) web , gave prescribed muzzle velocity of 2,000 ft/s (610 m/s).

armor-piercing shot, 37 mm, m80 standard

the overall length of 37mm m-74 ap-t (armor-piercing shot tracer) , m-51 apcbc-t (armor-piercing composite ballistic-capped shot tracer) armor-piercing projectiles used in m3a1, m5a1, , m6 tank , antitank guns (37 x 223r mm), great permit use in m4 gun. 37 mm (1.46 in) m80 ap-t shot developed , standardized.

the m80 armor-piercing tracer shot monoblock projectile tracer element of 3 seconds burning time. did not need fuze or bursting charge. weight of complete round 2.31 lb (1.05 kg), weight of ap shot 1.66 lb (750 g). propelling charge 0.15 lb (78 g) of m2 powder of hercules ng formula single-perforated grain , 0.030 in (0.76 mm) web.