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The barrel length is reduced to 310 mm. The 8 inch twist rate of the barrel is especially adapted to stabilize the long heavy projectiles used in subsonic ammunition. The propellant charge of subsonic ammunition is reduced to keep the bullet velocity (300–320 m/s (980–1,050 ft/s) below the speed of sound (~ 340 m/s (1,100 ft/s)).
This is most often the barrel of a rifle, though it may also refer to the cylinder of a revolver or the bolt of a bolt action rifle. In contrast to rifle barrels and revolver cylinders, rifle bolts are normally helically fluted, though helical fluting is sometimes also applied to rifle barrels.
Conversions for rifles and carbines of larger caliber, such as the AK-47 or Thompson submachine gun include a rifled insert barrel extending beyond the length of the chamber. [ 9 ] [ 10 ] One exception to the use of a special lightweight bolt was the Colt Service Ace , offered as a complete pistol or as a conversion kit for the M1911.
This gave a magnum power cartridge by rechambering surplus 8mm Mauser M98 rifles. [4] The lessons learned from this cartridge were put into the .308 and .358 Norma Magnum. While still popular, the .308 Norma Magnum has been largely supplanted by the .300 Winchester Magnum, mainly due to the availability of rifles chambered in this caliber. [1 ...
The .308 Winchester has a 3.64 mL (56 gr H 2 O) cartridge case capacity. [9] The exterior shape of the case was designed to promote reliable case feeding and extraction in bolt-action rifles and machine guns alike, under extreme conditions. .308 Winchester maximum C.I.P. cartridge dimensions. All dimensions in millimeters (mm) and inches.
Barrel/caliber change can occur in less than two minutes. In addition to the typical military requested calibers of .338 Lapua Magnum, .300 Winchester Magnum, and .308 Winchester calibers, Barrett also offers caliber conversion kits in .338 and .300 Norma Magnum, 7mm Remington Magnum, .260 Remington, and 6.5mm Creedmoor.
The Bor is a bullpup-configuration bolt-action magazine-fed sniper rifle. The configuration provides increased accuracy by allowing a barrel length of 680 mm (26.8 in), but minimizes the overall length of 1,038 mm (40.9 in). Weight is further reduced without sacrificing accuracy by the use of a free-floating fluted barrel.
The Model 100ATR is a bolt-action rifle from O.F. Mossberg & Sons. [1] ATR stands for "all-terrain rifle". The ATR is available in .243 Winchester, .270 Winchester, 7mm-08 Remington, .308 Winchester, .30-06 Springfield. It has a 4+1 round via internal magazine. [2] It currently features camouflage stocks as well as synthetic and walnut.