12-cm (120-mm) (4.7-Inch) Incendiary Projectile12.7-cm (127-mm) (5-Inch) High-Explosive
Japanese Explosive Ordnance – Army Ammunition – Navy Ammunition
Chapter 5 - Section 1
NAVY PROJECTILES
12.7-cm (127-mm) (5-Inch) Complete Round (Fixed)
Case:
Length: 22.88 inches.
Diameter of base: 6.66 inches.
Material: Brass.
Weight (empty): 16.28 inches.

The case is crimped tightly into a groove in the base of the projectile by a single conti-nuous crimp.

Propellant:
21 DC (type 31 propellant): 8.87 pounds (4.03 kg.).

Unperforated cylindrical sticks, approximately 2.1 mm (.079 in.) by 15.75 in., graphited double-base powder.

The propellant sticks are enclosed in a compartmented bag of heavy brownish silk.

Primer: Mk 2 case percussion primer Model 4.
Weapons in which used:
Type 88 12.7-cm/40 dual-purpose gun.
Type 89 12.7-cm/40 dual-purpose gun.

This latter is a modern gun, paired in a twin power-driven mount designed especially for antiaircraft aboard ships. It has been found ashore, unaltered, in the characteristic gun-houses mount used aboard ship.

Special features of this gun and mount are horizontal opposed sliding breech blocks, full power drive, and automatic fuze-setting accomplished as the loading tray moves the round into position to be rammed. The arrangement for loading and fuze-setting and the general plan of the mount corresponds closely to that of the Type 98 10-cm/65 twin mount.

Figure 395 – 12.7-cm Complete Round (Fixed).

12-cm (120-mm) (4.7-Inch) Incendiary Projectile12.7-cm (127-mm) (5-Inch) High-Explosive