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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 (2.540 in), the same as a .30-03 Springfield. However, resized cases often stretch making up the difference in length and "The slight difference ...
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 .280 Ackley Improved (.280 AI) was the result of the .280 Remington case modification by P.O Ackley, who pushed out the sidewalls at the shoulder to near parallel and steepened the shoulder angle to 40 degrees in order to increase powder capacity, thus along with increasing the allowable pressure, resulted in increasing the bullet initial velocity by approximately 100 fps.
.280 Remington 7mm-06 Remington 7mm Remington Express: 1957 7.214 (.284) 64.52 (2.54) 12.01 (.473) ... Case length Rim Base Shoulder Neck OAL 7.35×51mm Carcano: 7.57 ...
The commercial .280 Remington (or 7mm Express Remington) is very similar, but uses the slightly longer 65 mm 30-03 case with the shoulder headspace extended slightly more than one millimeter (.05 inch) to prevent chambering in .270 Winchester rifles. [17]
The American .280 Remington cartridge is probably the closest ballistic twin of the 7×64mm. When compared to the 7×64mm, the .280 Remington has a slightly lower maximum allowed chamber pressure and as an American 7 mm cartridge has a slightly smaller groove diameter. European 7 mm cartridges all have 7.24 mm (0.285 in) grooves Ø diameter. [6]
The .284 Winchester was designed to achieve .270 Winchester and .280 Remington performance from the new Winchester Model 100 autoloader and Winchester Model 88 lever-action rifles. The result was a 7 mm cartridge with about the same overall length as the .308 Winchester but with a wider body, that yields a powder capacity about the same as that ...
Longer case (1.935 in or 49.1 mm) with an overall length of 2.78 in (71 mm). 140-grain (9.1 g) bullet fired at 2,755 ft/s (839.7 m/s). 6.25 mm (6.25×43mm): A British experimental cartridge designed during the early 1970s, using the .280/30 as a parent case, which was necked down to fit a smaller bullet.