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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 20-round and 30-round magazines of these weapons limited their sustained automatic effectiveness when compared to belt-fed weapons. [8] The Army decided that an individual machine gun, lighter than the M60, but with more firepower than the M16, would be advantageous; troops would no longer have to rely on rifles for automatic fire. [13]