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The .30-06 JDJ is an improved form of the .30-06 Springfield cartridge designed for use in the Thompson Center Arms Encore platform. The body taper of the parent cartridge has been almost entirely eliminated in the JDJ design. The shoulder has also been blown forward considerably, with the angle sharpened to 60 degrees.
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 .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 differences between the two are the bullet shape, the types of powder used, and that the case of the 12.7×108mm is 9 mm longer and marginally more powerful. 14.5×114mm : The 14.5×114 mm is a heavy machine gun and anti-materiel rifle round used by the Soviet Union, the former Warsaw Pact, modern Russia, and other countries.
To facilitate handloading, casing geometry was based on the .30-06 Springfield, albeit shortened in order to fit into the aforementioned magazine designed for the .303 Savage. Newton recommended loading 100 grain (6.5 g) bullets at 2,800 ft/s (850 m/s); but Savage Arms reduced bullet weight to obtain a velocity of 3,000 ft/s (910 m/s), making ...
One of the more notable examples is the .30 Herrett, a .30-30 case necked back to reduce case capacity for more efficient loading with fast-burning powders. The .30 Herrett produces higher velocities with less powder than the larger .30-30 case in the short 10- and 14-in (25- and 35-cm) Contender barrels.
By comparison, the .30-06 M2 cartridge for M1 Garand rifle fired a ball bullet weighing 152 grains (9.8 g) at a muzzle velocity of 2,805 ft/s (855 m/s) and 2,655 ft⋅lb f (3,600 joules) of muzzle energy. Therefore, the M1 carbine is significantly less powerful than the M1 Garand.
The .30-06 Springfield was officially replaced by the 7.62 NATO M14 in 1957. During the 1940s and early 1950s, several experiments were carried out to improve the M1 Garand semi-automatic rifle. One of the most common complaints was the limited-capacity, eight-round en-bloc clip , and many experimental designs modified the weapon with a ...