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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.
For handloaders, two versions of reloading dies were manufactured, early dies and later dies that conformed to SAAMI specs (cf .280 Ackley Improved). If barrel length and chamber pressure are equal, the .280 Ackley Improved is about 100 fps faster with all bullet weights than the standard .280 Remington.
Parker Otto Ackley (May 25, 1903 – August 23, 1989) [1] was an American gunsmith, barrel maker, author, columnist, and wildcat cartridge developer. The Ackley Improved family of wildcat cartridges are designed to be easily made by rechambering existing firearms, and fireforming the ammunition to decrease body taper and increase shoulder angle, resulting in a higher case capacity.
.280 Ackley Improved.280 British.280 Flanged.280 Jeffery.280 Remington.280 Ross.284 Winchester ... Cartridge and reloading info can be found at Accurate Reloading
P.O. Ackley was a notable gunsmith famous for developing wildcat cartridges from parent cartridges like the 30-06 Springfield. For many of the wildcats listed above, and several of standardized commercial chamberings based on the 30-06 cartridge, there are "Ackley Improved" versions with sharper shoulders increasing case capacity. [25]
.280 Ackley Improved: 2007 US R [10] 7. ... Based upon a slightly shortened .308 Winchester cases with FTX bullets and special powder to approach .308 ballistics from ...
The .30-06 is also the parent case for many other popular hunting cartridges such as the venerable .270 Winchester, the .25-06 Remington, the .280 Remington, and the .280 Ackley Improved. All of them are balanced, flat-shooting cartridges ranking high among the most popular big game hunting cartridge for mid-sized species worldwide.
The .280 British was an experimental rimless bottlenecked intermediate rifle cartridge. It was later designated 7 mm MK1Z , and has also been known as .280/30 , .280 Enfield , 7 mm FN Short and 7×43mm .