Vickers machine guns. The best general-purpose ammunition for any .303 military rifle is the Mark 7 design because it provides the best combination of accuracy and stopping power. Headstamps and colour-coding Japanese 7.7 mm ammunition Imperial Japanese Navy Air Service adopted Ro-Go Ko-gata seaplane armed with a .303 MG in 1918, and the calibre was common on surplus Entente aircraft acquired by the Imperial Japanese Army Air Service after WWI, so its usage continued during the Interbellum, and on naval aircraft even throughout WWII. Japan produced a number of machine guns that were direct copies of the British Lewis (Japanese Type 92 machine gun) and Vickers machine guns as well as ammunition for them. The 7.7 mm cartridge used by the Japanese versions of the British guns is a direct copy of the .303 British (7.7×56mmR) rimmed cartridge and is distinctly different from the 7.7×58mm Arisaka rimless and 7.7×58mm Type 92 semi-rimmed cartridges used in other Japanese machine guns and rifles. Ball: . Cupro-nickel jacket with a composite aluminium/lead core. Black primer. Armour-piercing.: Brass jacket with a steel core. White primer. Tracer: . Cupro-nickel jacket with a lead core. Red primer. Incendiary: . Brass jacket with white phosphorus and lead core. Green primer. H.E.: Copper jacket with a PETN and lead core. Purple primer. Note: standard Japanese ball ammunition was very similar to the British Mk 7 cartridge. The two had identical bullet weights and a "tail-heavy" design, as can be seen in the cut-away diagram. Civilian use The .303 cartridge has seen much sporting use with surplus military rifles, especially in Australia, Canada, New Zealand, and to a lesser extent in the United States and South Africa. In Canada, it was found to be adequate for any game. In Australia, it was common for military rifles to be re-barrelled in .303/25 and .303/22. However the .303 round still retains a considerable following as a game cartridge for all game species, especially Sambar deer in wooded country. A change.org petition asking Lithgow Arms to chamber the LA102 centrefire rifle in .303 as a special edition release has attracted considerable attention both in Australia and worldwide. In South Africa, .303 Lee–Enfield rifles captured by the Boers during the Boer War were adapted for sporting purposes and became popular with many hunters of non-dangerous game, being regarded as adequate for anything from the relatively small impala to the massive eland and kudu.