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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.
It made 7.92mm Mauser, .30-06 Springfield, and 7.62mm NATO ammunition for the military and .303 British rifle ammunition for the civilian market. Packaging lists the date in the Ethiopian calendar year (7 to 8 years less than that of the Gregorian calendar ), while the cartridge headstamp uses the Common Era year.
The M25 is an orange-tipped 30-06 Springfield tracer cartridge consisting of a 145 gr bullet with 50 grains of IMR 4895 powder. The tracer compound contains composition R 321 which is 16% polyvinyl chloride, 26% magnesium powder, and 52% strontium nitrate. [8]
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.
A diagram of a .30-06 Springfield showing the bullet diameter (7.85 mm) and length (31.28 mm). The following formula is one recommended by Miller: [1] [dead link ] = (+) where m = bullet mass in grains (defined as 64.79891 milligrams) s = gyroscopic stability factor (dimensionless)
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The 6.5-06 A-Square uses a .264" diameter bullet loaded into a modified .30-06 Springfield cartridge. The neck is reduced to accept the smaller bullet, the shoulder is longer than that of the parent cartridge, and it has a 17.5 degree shoulder angle leading to the neck of the case, where the bullet is seated. [1]