Imperial Japanese Navy Ammunition
8cm (76.2mm)(3 Inch) Complete Round (Semi-fixed)
Case:
-Length: 15.06 inches
-Diameter at base: 4.13 inches
-Material: Brass (recovered); steel (documentary)
Propellant:
- 20 C3 (Type 89 propellant) 1.98 lbs (0.9 kg).
Unperforated cylindrical sticks, approximately 2mm by 12.75 inches, amber-colored double-base powder. The propellant sticks are enclosed in a bag of heavy brownish silk.
Primer: Mk I case percussion primer, Model 4
Weapon used in: "AN" (Armstrong) type 8cm/40 gun (low angle)
Except for minor changes, this is an exact copy of a British naval gun, and guns of both British and Japanese manufacture have been found ashore in Japanese emplacements for coastal defense. The gun is pedestal-mounted. The breech is closed by a two-step interrupted-thread block.
8cm (76.2mm)(3 Inch) (Ordinary Mk 2 Mod 2) High-Explosive Projectile
Weight of filled projectile (without fuze): 11.46 lbs
Weight of porjectile: 10.75 lbs
Weight stamped on rotating band (sample): 4.86 kg (varies with individual projectiles)
Length of projectile (without fuze): 9.49 inches
Diameter at bourrelet: 3 inches
Distance from base to rotating band: 0.44 inch
Width of rotating band: 1 inch
Radius of ogive: 6 cal.
Filling: Cast picric acid (Shimose) .71 lb
The charge consists of a single block of explosive cast and sealed in a waxed paper container, encased in a heavy cotton flannel bag and sealed in the projectile with paraffin.
Fuzing: Type 5-year point detonating fuze
Weapon used in: "AN" (Armstrong) Type 8cm/40 gun (low angle)
8cm (76.2mm)(3 Inch) Shrapnel Projectile
Assembled round:
-Weight of complete round (without fuze): 19 lbs
-Length of complete round (without fuze): 23.75 inches
Projectile:
-Weight of filled projectile (without fuze): 10.5 lbs
-Weight of projectile (empty): No data
Weight stamped on rotating band (sample): 2.86kg (Varies with individual projectiles)
Dimensions:
-Length of projectile (without fuze): 8.38 inches
-Diameter at bourrelet: 2.97 inches (75.5mm)
-Distance from base to rotating band: 0.75 inch
-Width of rotating band: 1 inch
-Radius of ogive: 4 cal
Filling: Black powder and shrapnel balls
Fuzing: 30-second time fuze
Weapons used in: Type 3-Year 8cm/40 dual-purpose gun
Type 88-Year 8cm/40 dual-purpose gun
Type 98-Year 8cm/60 dual-purpose gun
8cm (76.2mm)(3 Inch) Complete Round (Fixed)
Case:
-Length: 16.06 inches
-Diameter at base: 4.13 inches
-Material: Brass
-Weight (empty): 6.25 lbs
The case is crimped tightly into a groove in the base of the projectile by a single continuous crimp.
Propellant:
20 C3 (Type 89 propellant): 2.039 lbs
Unperforated cylindrical sticks, approximately 2mm by 12.9 inches, amber-colored double-base powder.
The propellant sticks are enclosed in a bag of heavy brownish silk. Primer Mk 2 case percussion primer, Model 4.
Weapons used in: Type 88 8cm/40 dual-purpose gun; 8cm/40 Type 4-Year dual-purpose gun.
The latter gun is a pedestal-mounted gun with a breech block sliding diagonally down to the right. Although designed as a ship-board mount, it is commonly found mounted in fixed emplacements ashore for anti-aircraft and coastal defense.
8cm (76.2mm)(3 inch)(Ordinary Mk 3 Mod 1) High Explosive
Assembled round:
-Weight of complete round: 19.25 lbs
-Length of complete round, with Type 89 fuze: 28.25 inches
Projectile:
-Weight of filled projectile (without fuze): 9.5 lbs
-Weight, empty: 8.6 lbs
-Weight stamped on rotating band (Sample) 4.865 kg (varies with individual projectiles)
Dimensions:
-Length of projectile (without fuze or adapter): 9.25 inches
-Diameter at bourrelet: 2.97 inches
-Distance from base to rotating band: 0.7 inch
-Width of rotating band: 1 inch
-Radius of ogive: 4 cal
Filling: Cast picric acid (Shimose): 0.9 lb
The charge consists of a single block of explosive cast and sealed in a waxed paper container, encased in a heavy cotton flannel bag and sealed in the projectile with paraffin.
Fuzing:
-A. Army Type 89 powder time fuze (30 seconds)
-B. Type 5-Year point detonating fuze (instantaneous) with adapter
Weapons used in:
Type 3-Year 8cm/40 dual-purpose gun
Type 88 8cm/40 dual-purpose gun
8cm(76.2mm)(3 inch)(Armor-Piercing Type 1) Special Common
Assembled round:
-Weight of complete round: 21.04 lbs
-Length of complete round: 25.31 inches
Projectile:
-Weight of filled projectile (with fuze): 12.7 lbs
-Weight, empty: 11.72 lbs
-Weight stamped on rotating band (sample): 5.31 kg (varies with individual projectiles
Dimensions:
-Length of projectile: 9.875 inches
-Diameter at bourrelet: 2.98 inches
-Distance from base to rotating band: 0.75 inch
-Width of rotating band: 1 inch
-Radius of ogive: 4 cal
Filling: Trinitroanisole (Type 91 explosive): 0.41 lb
The charge consists of a single block of explosive cast and sealed in a waxed paper container, encased in a heavy cotton flannel bag and sealed in the projectile with paraffin.
Fuzing: Type 1 fuze
Weapons used in:
-Type 3-Year 8cm/40 dual-purpose gun
-Type 88 8cm/40 dual-purpose gun
8cm(76.2mm)(3 inch) Time Practice Projectile
Assembled Round:
-Weight of complete round: No Data
-Length of complete round: 28.06 inches
Projectile:
-Weight of filled projectile: No Data
-Weight of projectile, empty: 12.3 lbs
-Weight stamped on rotating band (Sample): 5.2 kg (varies with individual projectiles)
Dimensions:
-Length of projectile: 12.69 inches
-Diameter at bourrelet: 2.98 inches
-Distance from base to rotating band: 0.69 inch
-Width of rotating band: 1 inch
-Radius of ogive: 4 cal
Filling: No Data. Possibly smoke compound or spotting dye.
Fuzing: Type 98 time fuze
Weapons used in:
-Type 98 8cm/60 dual-purpose gun
-8cm short dual-purpose gun
Next Time: 10cm and 12cm Projectiles (Part 1)
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