High-explosive_Tracer_shell.2C_37_mm.2C_M54_standard 37x145mmR_M4

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.