20-mm High-Explosive Tracer Projectile20-mm Armor-Piercing Incendiary Projectile
Japanese Explosive Ordnance – Army Ammunition – Navy Ammunition
Chapter 5 - Section 1
NAVY PROJECTILES
20-mm High-Explosive Tracer (Self-Destroying) Projectile
Fuzing: Model 1.
Weight of projectile (fuzed): 4.50 ounces.
Length of projectile (fuzed): 3.15 inches.
Length of complete round: Mk I, 5.58 inches, Mk II, 6.76 inches.
Filling: Pentolite (50 percent TNT, 50 percent PETN).
Weight of filling: 0.15 ounces.
Color and markings: Japanese, red over all; Swiss, black over all.

Remarks: The projectiles are similar to the H.E. tracer types except for their self-des-troying feature, which is accomplished by a hole, drilled through the septum of the pro-jectile. A black-powder train leads from the tracer, through the hole in the septum and the H.E. filling, to the base of the gaine.

Figure 353 – 20 mm High-Explosive Tracer (Self-Destroying) Projectile.

20-mm High-Explosive Tracer Projectile20-mm Armor-Piercing Incendiary Projectile