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The .260 Remington uses the .308 Winchester case as its parent cartridge which is simply necked down to accept a .264 caliber bullet with no further changes made to the case. As the cartridge follows a modern design, it has little taper which allowed its parent cartridge to feed reliably through auto-loading rifles such as the M14 , FN FAL and ...
.260 Remington, also known as 6.5-08 A-Square, introduced in 1997 6.5mm Creedmoor , 6.5×48 mm, introduced in 2007 6.5×47mm Lapua , a 2005 cartridge that fires the same diameter and weight 9.0g bullet as the 6.5×54mm but achieves a faster muzzle velocity
Several cartridges have been developed using the .308 Winchester as a parent case, some becoming very popular for hunting, particularly in North America. [10] These are the .243 Winchester, the .260 Remington (6.5-08 A-Square), the 7 mm-08 Remington, the .338 Federal, and the .358 Winchester (8.8×51mm).
The introduction of Remington's 7 mm Magnum in 1962 almost immediately eclipsed the .264 Win. Mag., even though the 264 Win. Mag. uses an identical brass cartridge case (the neck diameter of either cartridge case can easily be modified to accept the others' bullets by the handloader), it never fully recovered from the competition of the ...
The 6.5mm Remington Magnum is a .264 caliber (6.7 mm) belted bottlenecked cartridge introduced in 1966. [ 2 ] [ 3 ] The cartridge is based on a necked down .350 Remington Magnum which on turn is based on a shortened, necked down, blown out .375 H&H Magnum case. [ 4 ]
The 6.5mm Creedmoor designated as 6.5 Creedmoor by SAAMI, and as 6,5 Creedmoor by the C.I.P. [4] is a centerfire rifle cartridge introduced by Hornady in 2007. [6]It was developed by Hornady senior ballistics scientist Dave Emary in partnership with Dennis DeMille, the vice-president of product development at Creedmoor Sports, hence the name.
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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.