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There are small dimensional differences between the .256 Newton and 6.5-06 later standardized by A-Square: the 256 Newton has an increased body taper, the shoulder is moved back, and has a sharper, 23 degree shoulder while the 6.5-06 has a 17.5 degree shoulder like the parent 30-06 case. SAAMI lists the 6.5-06 A-Square in the Centerfile Rifle ...
.30-06 Springfield cartridge dimensions. All sizes in inches. 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 ...
Since its dimensions are taken from the 30-06 cartridge from the 1906 US Army cartridge, the lower half of these case dimensions have been used for designing the .243 Winchester, 25-06, .270 Winchester, .280 Remington, 7mm-08, .308, .30-06, .35 Whelen, and others.
The .30 Thompson Center (7.62×48 mm), designated 30 THOMPSON CENTER by SAAMI, 30 TC by the C.I.P., is a centerfire rifle cartridge developed for Thompson Center Arms by Hornady intended to deliver .30-06 Springfield performance in a .308 Winchester length round.
The 6.5-06 A-Square is a centerfire rifle cartridge that originated as a wildcat, based on the popular .30-06 Springfield. A-Square standardized the dimensions of the cartridge and submitted them to SAAMI in 1997.
The .30-06 is substantially more popular and manufacturers thus offer a much greater selection of loads at a substantially lower price point. While it is true that a .280 Remington case can be formed from a .30-06 Springfield case, the case length of a .30-06 is 63.3 millimetres (2.494 in) while the case length of a .280 is 64.5 millimetres (2. ...
SAAMI compliant .30-378 Weatherby Magnum cartridge schematic: All dimensions in inches [millimeters]. SAAMI recommends a 6 groove barrel with a twist rate of 10 in (250 mm). The recommended bore diameter is .3005 in (7.63 mm) and groove diameter is .3080 in (7.82 mm) with each groove having an arc width of .118 in (3.0 mm).
The .30-06 Springfield cartridge (7.62×63mm), with its higher service pressure and case capacity, will outperform the 7.62×54mmR when same-length test barrels are used, though this is very uncommon as .30-06 Springfield firearms are generally sold with much shorter barrels than 7.62×54mmR firearms. [4]