jap 77The 7.7×58mm Arisaka cartridge was the standard military cartridge for the Imperial Japanese Army and the Imperial Japanese Army Air Service during World War II. The 7.7×58mm cartridge was desned as the successor ofThe 7.7 Jap is comparable to the 7.62x51mm NATO in terms of ballistic performance and effectiveness in combat situations. It shares similarities with the .303 British,