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TM 43-0001-27
CARTRIDGE, 20MM, TARGET PRACTICE, M55A2
Type Classification: STD - AMCTC 7741.

Use: Guns, 20mm, M39, M61 and M68. The cartridge is
a training round intended as a substitute for a service
round to be used in target practice.

Description: TARGET PRACTICE Cartridge. The one piece
projectile cavity is hollow. The nose (ogive) made of
aluminum or steel is swaged to the projectile body. The
projectile is painted blue with markings in black. It
consists of a solid projectile without a fuze.

Function: The projectile is inert, therefore no specific function
takes place upon impact except penetration of the target.

Tabulated Data:
DODAC........................................ 1305-A897
UNO serial number ...................... 0339
UNO proper shipping name ; Cartridges for weapons, inert projectiles

Weight ......................................... 3935 gr
Length.......................................... 6.615 in. (168 mm)
Tracer .......................................... NA

Primer.......................................... Electric, M52A3B1
Fuze............................................. NA

Explosive:
Type ......................................... NA
Weight ...................................... NA

Incendiary:
Type ......................................... NA
Weight ...................................... NA
Propellant:
Type ......................................... WC 870 or WC 872
Weight ...................................... MBR (585 or 605 gr)

Performance: Chamber pressure........................ 60,500 psi
Velocity ........................................ 3380 fps, 78 ft from muzzle

Shipping and Storage Data:
Quantity-distance class/
SCG.......................................... 1.4C
Storage code................................ Class V
DOT shipping class ...................... C
DOT designation .......................... SMALL ARMS
AMMUNITION
Drawing number........................... 7258817

References:
SB 700-20
TM 9-1005-286-10
TM 9-1300-206 14-11