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The .45 Auto Rim, also known as 11.5x23mmR, is a rimmed cartridge specifically designed to be fired in revolvers originally chambered for the .45 ACP cartridge.. The Peters Cartridge Company developed the cartridge in 1920 for use in the M1917 revolver, large numbers of which had become available as surplus following the end of World War I. [3]
The .45 ACP (Automatic Colt Pistol), also known as .45 Auto, .45 Automatic, or 11.43×23mm [1] is a rimless straight-walled handgun cartridge designed by John Moses Browning in 1904, for use in his prototype Colt semi-automatic pistol. After successful military trials, it was adopted as the standard chambering for Colt's M1911 pistol. [2]
A rim is an external flange that is machined, cast, molded, stamped, or pressed around the bottom of a firearms cartridge. Thus, rimmed cartridges are sometimes called "flanged" cartridges. Almost all cartridges feature an extractor or headspacing rim, in spite of the fact that some cartridges are known as "rimless cartridges".
A rimmed cartridge is a cartridge with a rim, whose primer is located in the center of the case head; the primer is detonated by the firing pin striking that center location. A rimfire cartridge also has a rim, but the primer is located around the rim; the primer is detonated by striking the rim. [1]
For these reasons, in 1920, the Peters ammunition company introduced the .45 Auto Rim. This rimmed version of the .45 ACP allowed both versions of the Model 1917 revolver to fire reliably without the clips. In the late 1950s and 1960s, Colt and Smith & Wesson 1917s were available through mail order companies at bargain prices. [11]
.45 Auto Rim.45 Schofield.45-60 Winchester.45-70.50-70 Government.50-110 Winchester.50-140 Sharps.219 Donaldson Wasp.219 Zipper.220 Rook.222 rimmed.255 Jeffery Rook.300 Rook.300 Sherwood.303/25.303 British.303 Savage.375/303 Westley Richards Accelerated Express.307 Winchester.348 Winchester.357 Magnum.360 No. 5 Rook.380 Long.375 Winchester
The .45 Colt at that time did not enjoy the .44-40's advantage of a Winchester rifle chambered for it being available, thus allowing the use of the same cartridge in both a pistol and a rifle. [7] According to rumor at the time, this was owing to early .45 Colt cartridges having a very narrow rim that caused ejection issues from a rifle chamber.
Rim diameter.480 in (12.2 mm) ... The .45 Super / 11.5x22mm is a powerful smokeless powder center fire ... Grennell chose to use brass formed from the stronger and ...