.45 caliber ammunition
.45 caliber ammunition comprises bullets (approximately 0.45 inch in diameter), first standardized by Colt's Patent Firearms Manufacturing Company in 1872.
The .45 ACP is a cartridge designed by John Browning in 1904, for use in the prototype Colt semi-automatic .45 pistol he also designed. This ammunition also served the M1911 pistol adopted by the Army in 1911.
The .454 Casull is an adaptation of the .45 Colt developed in 1959. It's bullet and case dimension largely match the .45 Colt with the exception of its length. This is to accommodate a larger powder charge, essentially making it a magnum version of the .45 Colt.
Although not in name, the .460 S&W Magnum is a .45 caliber round, also a magnum version of its parent cartridge, the .454 Casull. It uses the same bullet dimensions as the .454 Casull and the .45 Colt, but it's case dimensions differ from the .454 Casull in more than just length.
A positive consequence of the relationship between the .460 S&W Magnum, .454 Casull, and the .45 Colt is that bolt and lever action rifles and revolvers chambered for the larger caliber can frequently chamber the smaller caliber. The reverse, however, is not true and may result in firearm damage or bodily harm if attempted.
The 45 Raptor is a rifle round developed for the AR-10 and similar platforms. It's a hybrid of the .460 S&W Magnum and the .308 Winchester. It uses the same bullet, powder charge, and primer as the .460 S&W Mag. but is a rimless design matching the specifications of the .308 Win. This allow the 45 Raptor to be chambered in an AR-10 style rifle by only changing the barrel, barrel extension, and use a modified magazine which will retain its original capacity. The receivers, bolt carrier group, buffers, and other components remain the same.
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