Type Classification: Tracer R505 or R403
STD - AMCTC 7404. Fuze NA
Use: Type NA
Guns, 20mm, M39, M61 and M168. The cartridge is Incendiary:
for practice and training. Type NA
Type WC 870 or WC 872
TARGET PRACTICE-TRACER Cartridge. The Weight MBR (585-605 gr)
cartridge is ballistically and physically identical to the
M55A2 cartridge except that a tracer element has been Performance:
added to the base of the projectile. The projectile is painted blue with orange colored markings. Chamber pressure 61,500 psi
Velocity 3380 fps, 78 ft
Function: from muzzle
The projectile is similar to the M56A3 projectile, but has no high explosive incendiary charge and is assembled with a dummy fuze. The projectile does contain a tracer composition which burns visibly for a minimum of 1.9 seconds.
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