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Type 99 7.7 mm rimless
300px
7.7×58mm Arisaka
Type Rifle
Place of origin Flag of Japan.png Japan
Production history
Produced 1939–1945
Variants Type 92 semi-rimmed 7.7 mm, Navy type 7.7 mm
Specifications
Bullet diameter 7.89 mm (Bad rounding hereScript error in)
Neck diameter 8.07 mm (Bad rounding hereScript error in)
Shoulder diameter 11 mm (Bad rounding hereScript error in)
Base diameter 12 mm (Bad rounding hereScript error in)
Rim diameter 12 mm (Bad rounding hereScript error in)
Rim thickness 1.0 mm (Bad rounding hereScript error in)
Case length 58 mm (Bad rounding hereScript error in)
Overall length 79.5 mm (Bad rounding hereScript error in)
Primer type Large Rifle
Ballistic performance
Bullet weight/type Velocity Energy
11.3 g (Bad rounding hereScript error gr) (Ball)730 m/s (Bad rounding hereScript error ft/s)3,007 J (Bad rounding hereScript error ft·lbf)
Type 92 semi-rimmed 7.7 mm
250px
Various Type 92 rounds
Type Machine gun round
Place of origin Japan
Service history
Used by Japan
Wars Second World War
Production history
Variants Type 99 rimless 7.7 mm (Arisaka), Navy type 7.7 mm
Specifications
Case length 2.25 in (Bad rounding hereScript error mm)
Overall length 3.14 in (Bad rounding hereScript error mm)
Ballistic performance
Bullet weight/type Velocity Energy
203 gr (Bad rounding hereScript error g) (Ball)2,400 ft/s (Bad rounding hereScript error m/s)2,600 ft·lbf (Bad rounding hereScript error J)
Test barrel length: 29.5 inches

The 7.7×58mm Arisaka cartridge or Type 99 rimless 7.7 mm was chambered in the World War II Arisaka Type 99 Rifle. The cartridge was designed to replace the aging 6.5×50mm Arisaka cartridge after seeing the 8×57 IS in action in China during 1937. Due to lack of materials the plan to phase out the 6.5 mm Arisaka cartridge by the end of the war was not completed.

While the round chambered by the Arisaka rifle used a rimless case, rimmed and semi-rimmed variants were produced for use in some Japanese machine guns. This machine gun ammunition is more powerful, and the altered rim is meant to prevent it from being chambered in a rifle. The 7.7 mm Arisaka uses the same .311–.312" bullets as the .303 British,[1] and its cartridge case is similar in power to the .30-06 Springfield (7.62×63mm). Factory loaded ammunition and brass cases are available from Norma and Graf; Hornady, Sierra and Speer also produce usable bullets. Reloadable cartridge cases can be produced by reforming .30-06 brass, or fire forming 7.92×57mm cases. Case heads derived from the .30-06 will be slightly undersized and will bulge slightly just ahead of the web on firing, while the 7.92×57mm derived cases will be slightly short. Normal cases of the correct dimensions will also bulge slightly, however, as most Japanese rifles of this era had slightly oversized chambers, intended to allow the bolt to be closed on a round even in a very dirty chamber. Reloading data for .303 British is a good starting point for load development, since the two cartridges are nearly identical.

The 7.7×58mm Arisaka as a sporting cartridge is suitable for most big game with proper bullet selection.

7.7×58mm Type 92 Edit

The Type 92 (Semi-rimmed) 7.7 mm (7.7×58mm SR) was a machine gun cartridge and was primarily used with the Type 92 Heavy Machine Gun and the earlier Type 89 flexible and fixed air-cooled machine guns used on Japanese planes.

Japanese ammunitionEdit

All Japanese ammunition used gilding metal jackets for the bullets on ball and the PETN-filled flat-tipped explosive incendiary, cupro-nickel jackets for tracer and phosphorus incendiary and a brass bullet with steel core for armor-piercing.

  • Ball—lead core
  • Tracer—lead core
  • A.P.—hard steel core
  • IncendiaryWhite phosphorus and lead
  • H.E.—PETN and lead

Late war ammunition can still be encountered, although it is generally advised to not fire it, due to its collectability and the possibility of a hangfire or squib.

GalleryEdit

See alsoEdit

ReferencesEdit

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