6.5×50mmSR Arisaka

6.5×50 Arisaka
6.5×50mmSR Arisaka (center) with .303 British (left) and .30-06 (right).
TypeRifle cartridge
Place of originEmpire of Japan
Service history
Used byEmpire of Japan, Russian Empire, United Kingdom, China, North Korea, South Korea, Thailand, Finland, Indonesia, Cambodia, Poland
WarsRusso-Japanese War, World War I, Second Sino-Japanese War, World War II, Indonesian War of Independence, Korean War, Malayan Emergency
Production history
Produced1897–1945
Specifications
Case typeSemi-rimmed, bottleneck
Bullet diameter6.63 mm (0.261 in)
Land diameter6.33 mm (0.249 in)
Neck diameter7.37 mm (0.290 in)
Shoulder diameter10.40 mm (0.409 in)
Base diameter11.45 mm (0.451 in)
Rim diameter12.08 mm (0.476 in)
Rim thickness1.143 mm (0.0450 in)
Case length51.00 mm (2.008 in)
Overall length76.00 mm (2.992 in)
Case capacity3 cm3 (46 gr H2O)
Rifling twist1/9 inches
Primer typeLarge rifle
Maximum pressure (C.I.P.)295.0 MPa (42,790 psi)
Ballistic performance
Bullet mass/type Velocity Energy
138.9 gr (9 g) FMJ 770 m/s (2,500 ft/s) 2,666 J (1,966 ft⋅lbf)
Test barrel length: 800 mm

The 6.5×50mmSR Arisaka (designated as the 6,5 × 51 R (Arisaka) by the C.I.P.) 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.

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