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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.
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 RPR was originally announced in the following calibers and configurations: .308 Win. with 1:10 twist, 20 in (51 cm) barrel, weighing 9.7 lb (4.4 kg) 6.5 Creedmoor with a 1:8 twist, 24 in (61 cm) barrel, weighing 10.6 lb (4.8 kg)
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 .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.
Brügger & Thomet APR: Top chambered in .338 Lapua Magnum and bottom chambered in .308 Winchester. The APR308 is available in several specialized variants. The APR308P was designed for tactical police applications and has a shorter, 500 mm (19.7 in) barrel with a different muzzle device. The rifle is to be used exclusively with optical sights ...
Barrel changes by an experienced person can take place in under 60 seconds. The Tactical 1 (very low production) or 2 version is available in .223 Remington , .308 Winchester , .300 Winchester Magnum and .338 Lapua Magnum and has a larger frame, action and barrel to accommodate the use of the .338 Lapua Magnum chambering.