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In Europe the .280 Remington is not popular in bolt-action rifles since it competes directly with the 7×64mm, which is of the almost exact same size as the .280 Remington but has slightly more power, because of having a slightly higher maximum allowed chamber pressure and a slightly higher case capacity. The twist rate for the 7x64 is 1 in 8. ...
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.
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]
Neck Overall length 7×20mm Nambu [1] 1903: 7.112 (.280) rimless bottleneck: 19.81 (0.78) 9.12 (.359) ... .280 Remington 7mm-06 Remington 7mm Remington Express: 1957
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 .270 Winchester and .280 Remington cartridges were based on reducing the neck diameter of the .30-03 cartridge case [dubious – discuss] to retain a similar overall length with the same shoulder based on observation of the Chinese military trials of 6.8x57 Mauser in the US. [citation needed]
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The .280 British was an experimental rimless ... Neck OAL MV Bullet Weight .280 British: ... 6.5mm Grendel, 6.8mm SPC, 7mm Benchrest Remington, .280/30 British, 7 mm ...