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The origin of the Me 264 design came from Messerschmitt's long-range reconnaissance aircraft project, the P.1061, of the late 1930s.A variant on the P.1061 was the P.1062 of which three prototypes were built, with only two "engines" to the P.1061's four, but they were the more powerful Daimler-Benz DB 606 "power systems", each comprising a pair of DB 601 inverted V-12 engines.
The 6.5mm Creedmoor was designed for target shooting at longer ranges, and as such, couples a sensible ratio of case volume (3.40 ml) to bore area (34.66 mm 2 /0.3466 cm 2) with ample space for loading long slender projectiles providing good aerodynamic efficiency and external ballistic performance for the projectile diameter. [4]
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.
Size: Metric size - may not be official; MV: Muzzle velocity, in feet-per-second; ME: Muzzle energy, in foot-pounds; P: Momentum, in pound (force) (lbf) times seconds. [1] A guide to the recoil from the cartridge, and an indicator of bullet penetration potential.
Calibers fall into four general categories by size: [citation needed] miniature-bore historically refers to calibers with a diameter of 0.22 inches (5.6 mm) or smaller; small-bore refers to calibers with a diameter of 0.32 inches (8.1 mm) or smaller; medium-bore refers to calibers with a diameter of 0.33 inches (8.4 mm) to 0.39 inches (9.9 mm)
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.
120 mm (4.7 in) 12 cm kan M/94 (Bofors 12 cm naval gun L/45 model 1894) Sweden-Norway: 1890s - Cold War 120 mm (4.7 in) 12 cm kan M/11 (Bofors 12 cm naval gun L/45 model 1911) Sweden: World War I - Cold War 120 mm (4.7 in) 12 cm kan M/24 (Bofors 12 cm naval gun L/45 model 1924) Sweden: Interwar - Cold War 120 mm (4.7 in)
Measurements are in millimeters then inches, i.e. mm (in). Pistol cartridges Name ... .264 in (6.6 mm) and up. Name Bullet Case length Rim Base Shoulder Neck