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BL 4 inch naval gun Mk I - VI United Kingdom: 1880s - 1900 102 mm (4.0 in) BL 4 inch Mk VII 50-caliber United Kingdom: World War I - World War II 102 mm (4.0 in) BL 4 inch Mk VIII & XI 40-caliber United Kingdom: World War I - World War II 102 mm (4.0 in) BL 4 inch Mk IX naval gun 45-caliber United Kingdom: World War I - World War II
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The traditional 6.5×68mm twists nowadays inhibits its potential. To make the 6.5×68mm an awesome long-range cartridge, rifle barrels with a 200 mm to 230 mm (1 in 7.9 to 9 inch) twist rate are a better choice. Due to the large case capacity in relation to the 6.5 mm (.264 inch) caliber bore size the 6.5×68mm is very harsh on barrels.
The 6.5 mm (.264 caliber) has been extremely popular in Europe and especially in the Scandinavian countries and this trend continues today. [5] The 6.5×52mm Carcano, 6.5×53mmR (.256 Mannlicher), 6.5×54mm Mannlicher-Schönauer, 6.5×55mm Swedish Mauser, 6.5×58mmR Krag–Jørgensen and the 6.5×58mm Portuguese are among these cartridges of originally military European origin.
The 6.5mm Grendel is an intermediate cartridge jointly designed by British-American armorer Bill Alexander, competitive shooter Arne Brennan (of Houston, Texas) and Lapua ballistician Janne Pohjoispää, as a low-recoil, high-precision rifle cartridge specifically for the AR-15 platform at medium/long range (200–800 yard).
The 6mm Lee Navy (6×60mmSR), also known as the 6mm U.S.N. [1] or .236 Navy, [2] is an obsolete American rifle cartridge. [3] It was the service cartridge of the United States Navy and Marine Corps from 1895 (therefore replacing the .45-70 Government rifle cartridge) to 1899, when it was then itself replaced by the more modern .30-40 Krag rifle cartridge.
The 6.5mm Creedmoor designated as 6.5 Creedmoor by SAAMI, and as 6,5 Creedmoor by the C.I.P. [ 4 ] is a centerfire rifle cartridge introduced by Hornady in 2007. [ 6 ] It was developed by Hornady senior ballistics scientist Dave Emary in partnership with Dennis DeMille, the vice-president of product development at Creedmoor Sports, hence the name.
The 6.5-284 has been used extensively in benchrest competitions and is known as an extremely accurate long range round. Using an improved version of the 6.5-284, Rich DeSimone set a 1,000-yard (914.4 m) world record with a 1.564-inch (39.73 mm) group. [4]