Talyn
SAINT
The 7.7x58mm Arisaka
The 7.7×58mm Arisaka cartridge was the standard military cartridge for the Imperial Japanese Army's and the Imperial Japanese Army Air Service during World War II. The 7.7×58mm cartridge was designed as the successor of the 6.5x50mmSR cartridge for rifles and machine guns but was never able to fully replace it by the end of the war.
In 1937, however, rimless cartridges were found to have better performance in the testing for the magazine fed Type-97 in vehicle heavy machine gun. As the result, the Type 97, 7.7×58mm rimless cartridge was adopted in late 1937 by reducing the Type 92 case rim from 12.7 to 12.0 mm. The case of the Type 97 cartridge would later be modified in 1940 during the development of the Type 99 rifles and light machine guns, where it was decided that a lighter bullet of 11.8 g (182 gr) was more efficient on short range target.
With the final adoption of the rimless Type 99 7.7×58mm ball cartridge in 1940, the rim diameter of the Type 97 cartridge was standardised to 12.1mm while the late production Type 92 ammunition was modified by reducing the diameter of the case rim from 12.7 to 12.1 mm to further simplify logistics
The 7.7×58mm Arisaka, as a sporting cartridge, is suitable for most big game with proper bullet selection. The 7.7 mm Arisaka uses the same .311–.312 inch bullets as the .303 British and the standard military load delivered the same muzzle energy as the .303 British. Factory loaded ammunition and brass cases are available from Norma and Graf's; and Hornady, Sierra and Speer produce usable bullets. Reloadable cartridge cases are produced by reforming .30-06 brass, or fire-forming 8x57mm IS cases. Case heads derived from the .30-06 are slightly undersized and bulge slightly just ahead of the web on firing, while the 8×57mm IS derived cases are slightly short.
Normal cases of the correct dimensions 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.
The 7.7×58mm Arisaka cartridge was the standard military cartridge for the Imperial Japanese Army's and the Imperial Japanese Army Air Service during World War II. The 7.7×58mm cartridge was designed as the successor of the 6.5x50mmSR cartridge for rifles and machine guns but was never able to fully replace it by the end of the war.
In 1937, however, rimless cartridges were found to have better performance in the testing for the magazine fed Type-97 in vehicle heavy machine gun. As the result, the Type 97, 7.7×58mm rimless cartridge was adopted in late 1937 by reducing the Type 92 case rim from 12.7 to 12.0 mm. The case of the Type 97 cartridge would later be modified in 1940 during the development of the Type 99 rifles and light machine guns, where it was decided that a lighter bullet of 11.8 g (182 gr) was more efficient on short range target.
With the final adoption of the rimless Type 99 7.7×58mm ball cartridge in 1940, the rim diameter of the Type 97 cartridge was standardised to 12.1mm while the late production Type 92 ammunition was modified by reducing the diameter of the case rim from 12.7 to 12.1 mm to further simplify logistics
The 7.7×58mm Arisaka, as a sporting cartridge, is suitable for most big game with proper bullet selection. The 7.7 mm Arisaka uses the same .311–.312 inch bullets as the .303 British and the standard military load delivered the same muzzle energy as the .303 British. Factory loaded ammunition and brass cases are available from Norma and Graf's; and Hornady, Sierra and Speer produce usable bullets. Reloadable cartridge cases are produced by reforming .30-06 brass, or fire-forming 8x57mm IS cases. Case heads derived from the .30-06 are slightly undersized and bulge slightly just ahead of the web on firing, while the 8×57mm IS derived cases are slightly short.
Normal cases of the correct dimensions 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.
