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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 .30-06 Springfield cartridge case can hold 68.2 grains and has a volume of 4.42 millilitres (0.270 in 3). 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. [citation needed].30-06 Springfield maximum C.I.P. cartridge dimensions.
The 30-06 Springfield cartridge (pronounced “thirty-ought-six”, "thirty-oh-six") or 7.62×63mm in metric notation, was introduced to the United States Army in 1906 (hence “06”) where it was in use until the late 1970s. It remains a very popular sporting round, with ammunition produced by all major manufacturers.
The principle at work in the short magnum cartridge is the fitting of larger volumes of powder in closer proximity to the primer's flash hole, resulting in more-uniform ignition. .300 WSM has a case capacity of 80 grains. The .30-06 Springfield holds 69 grains; .308 Winchester holds 56 grains; 30-30 Winchester holds 45 grains.
The round itself was based on the .30-03, but rather than a 220-grain (14 g) round-tip bullet fired at 2,300 ft/s (700 m/s), it had a 150-grain (9.7 g) pointed bullet fired at 2,800 ft/s (850 m/s); the case neck was a fraction of an inch shorter as well. The new American cartridge was designated Cartridge, Ball, Caliber .30, Model of 1906.
The M196 tracer cartridge (54-grain bullet) 5.56×45mm NATO was developed for the original M16 rifle and is compatible with the M16A1 barrel also using 1:12 rifling twist. It has a red tip and is designed to trace out to 500 yards, and its trajectory matches the M193 (56-grain) ball cartridge, which has no tip color.
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The most commonly encountered chamber inserts are ones designed to convert .30-06 Springfield to the shorter 7.62×51mm NATO. Since the chamber insert remains in the chamber, this type of conversion will function in semi-automatic firearms , and is commonly used in military surplus arms such as the M1 Garand , allowing the use of often less ...