jap 77The 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,The 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 of