Type 99 20-mm Ammunition20-mm High-Explosive Incendiary Projectile
Japanese Explosive Ordnance – Army Ammunition – Navy Ammunition
Chapter 5 - Section 1
NAVY PROJECTILES
20-mm High-Explosive Projectile
Fuzing:

Japanese: Mod 2.

Swiss: Mod 1.

Weight of projectile (fuzed):4.50 ounces.
Length of projectile (fuzed): 3.23 inches.
Length of complete round: Mk I, 5.66 inches, Mk II, 6.84 inches.
Filling: Pentolite (50 percent TNT, 50 percent PETN).
Weight of filling: 0.35 ounces.
Color and markings:

Japanese: brown over-all (modifications indicated by white bands).

Swiss: 1. Yellow over-all. 2. Dark brown over-all.

Remarks: Ammunition of Swiss manufacture has been found to contain slightly more ex-plosion than the Japanese round.

Figure 350 – 20-mm High-Explosive Projectile.

Type 99 20-mm Ammunition20-mm High-Explosive Incendiary Projectile