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The 6.5×50mmSR Arisaka (designated as the 6,5 × 51 R (Arisaka) by the C.I.P. [1]) is a semi-rimmed rifle cartridge with a 6.705 mm (.264 in) diameter bullet. It was the standard Japanese military cartridge from 1897 until the late 1930s for service rifles and machine guns when it was gradually replaced by the 7.7×58mm Arisaka.
By 1940 more than three million Type 38s had been issued to the Imperial Japanese Army. However, a concern that the 6.5×50mmSR Arisaka cartridge did not compare favorably to the ammunition used by the other great powers in the war led to the introduction of a further generation of rifles in 1939, during the Second Sino-Japanese War.
As most weapons from the Imperial Japanese Armory were thrown into Tokyo Harbor after the signing of the surrender, ammunition for the Arisaka rifle also became rare, although China continued to manufacture 6.5×50mmSR and 7.7×58mm for use in their captured rifles.
[12] [10] As with the Type 11, it continued to use the same 6.5×50mm Arisaka cartridges as the Type 38 rifle infantry rifle, [13] although the adoption of the more powerful 7.7×58mm Arisaka rimless round for the Type 99 rifle soon created a demand for a new light machine gun capable of firing the same ammunition, the Type 99 light machine gun ...
6.5×50mmSR Arisaka, Japanese military cartridge; 6.5×52mm Mannlicher–Carcano, Italian military cartridge; 6.5×53mmR, Dutch and Romanian military cartridge; 6.5×54mm Mannlicher–Schönauer, Greek military cartridge; 6.5×55mm, Swedish-Norwegian military cartridge; 6.5×68mm, rebated rim bottlenecked centerfire rifle cartridge
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 designed as the successor of the 6.5×50mmSR cartridge for rifles and machine guns but was never able to fully replace it by the end of the war.
The 6.5×52mm Carcano, also known as the 6.5×52mm Parravicini–Carcano or 6.5×52mm Mannlicher–Carcano, is an Italian military 6.5 mm (.268 cal, actually 0.2675 inches) rimless bottle-necked rifle cartridge, developed from 1889 to 1891 and used in the Carcano 1891 rifle and many of its successors.
During the Second Sino-Japanese War in the 1930s, the Japanese soon found that the 7.7mm cartridge being fired by their Type 92 heavy machine gun in China was superior to the 6.5×50mm cartridge of the Type 38 rifle.