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Remington 788 with the 18.5 inch barrel in 243 Win caliber made in 1982. A left-handed version was produced in .308 and 6mm Remington calibers. The Carbine version with an 18.5-inch (47 cm) barrel was produced in .308 Winchester, 7mm-08, and .243. The stock was revised in 1980 being the only significant change throughout the production history.
Remington was quick to respond to early criticism by changing the twist rate by 1958 to allow for heavier bullets, as well as replacing the 722BDL with the even more upscale Model 725ADL rifle in 1958 and ultimately transitioning to the highly successful Model 700.
Thus the optimum rate of twist for this bullet should be approximately 12 inches per turn. The typical twist of .30-06 caliber rifle barrels is 10 inches per turn, accommodating heavier bullets than in this example. A different twist rate often helps explain why some bullets work better in certain rifles when fired under similar conditions.
The primary difference between the U.S. Army and the U.S. Marine Corps rifles is that while the U.S. Marine Corps M40 variants use the short-action version of the Remington 700/40x (which is designed for shorter cartridges such as the .308 Winchester/7.62×51 mm NATO), the U.S. Army M24 uses the Remington 700 Long Action. [25]
.260 Remington SAAMI compliant schematic. All dimensions in inches [millimeters]. SAAMI recommends a barrel with a 6 groove contour and a twist rate of one revolution every 9 in (229 mm) with each groove having a width of .095 in (2.41 mm). The recommended bore diameter is .256 in (6.50 mm) and the groove diameter is .264 in (6.71 mm).
SAAMI compliant .300 Remington Ultra Magnum cartridge schematic: All dimensions in inches [millimeters]. SAAMI recommends that the barrel have a 6 groove contour with a twist rate of one revolution in 10 in (250 mm). The barrel is to have a groove width of .115 in (2.9 mm). Bore is given as .300 in (7.6 mm) and a groove is .308 in (7.8 mm).
Barrel length helps determine a specific cartridge's muzzle velocity. A longer barrel typically yields a greater muzzle velocity, while a shorter barrel yields a lower one. The first AR-15 rifles used a barrel length of 20". In the case of the 223 Remington (M193), ammunition loses or gains about 25.7 ft/sec (7.8 m/s) for each inch of barrel ...
Rifling twist: 1971-1972 (1:10) 1973–present (1:9) ... The .17 Remington / 4.4x45mm is a rifle ... A significant disadvantage is the rapid rate at which such a ...