.45 Auto Rim

Reloading data for .45 Auto Rim cartridges and specifications for cases and loads in this caliber.
Product number: CID_727
Load data for caliber ".45 Auto Rim"
The .45 Auto Rim is a rimmed centerfire cartridge that was developed in the early 20th century as an alternative to the .45 ACP cartridge. It was designed to be used in revolvers that could not reliably use the rimless .45 ACP cartridge, such as the Colt New Service and Smith & Wesson Model 1917.

The .45 Auto Rim has a bullet diameter of .452 inches (11.5 mm) and a case length of .898 inches (22.8 mm), which is the same as the .45 ACP cartridge. However, the .45 Auto Rim has a rimmed case, which allows it to be used in revolvers that require the use of moon clips to properly extract and eject the rimless .45 ACP cartridge.

The .45 Auto Rim is loaded to similar velocities and energies as the .45 ACP cartridge, with a typical muzzle velocity of around 800 to 900 feet per second (245 to 275 m/s) and a muzzle energy of around 350 to 450 foot-pounds (475 to 610 J). It is primarily used for target shooting and hunting, although it has largely been replaced by more modern cartridges in these applications.

While the .45 Auto Rim is not as widely used as some other handgun cartridges, it remains a popular choice among collectors and enthusiasts of classic revolvers. It also has some practical applications, particularly for shooters who prefer to use revolvers for self-defense or hunting and require the use of a rimmed cartridge.

You find .45 Auto Rim with all common powders and bullets by clicking the 'Loads in this caliber' button above.

Technical Specifications (based on the respective safety standard - see more details in tab 'Datasheet' if available)

Caliber: .45 Auto Rim
Cartridge Type: Pistol/Revolver
Bullet Diameter: 0.451 '' | 11.46 mm
Max. Case Length (l3):0.9'' | 22.81 mm
Max .Cartridge Length / OAL:1.27'' | 32.38 mm
Maximum Standardized Pressure:17404.8 psi | 1200 bar
The Commission internationale permanente pour l'épreuve des armes à feu portatives ("Permanent International Commission for the Proof of Small Arms" – commonly abbreviated as C.I.P.) is an international organisation which sets standards for safety testing of firearms. (The word portatives ("portable") in the name refers to the fact the C.I.P. tests small arms almost exclusively; it is ordinarily omitted from the English translation of the name.) As of 2015, its members are the national governments of 14 countries, of which 11 are European Union member states. The C.I.P. safeguards that all firearms and ammunition sold to civilian purchasers in member states are safe for the users.
To achieve this, all such firearms are first proof tested at C.I.P. accredited Proof Houses. The same applies for cartridges; at regular intervals, cartridges are tested against the C.I.P. pressure specifications at the ammunition manufacturing plants and at C.I.P. accredited Proof Houses.

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