.357 Auto Magnum

Reloading data for .357 Auto Magnum cartridges and specifications for cases and loads in this caliber.
Product number: CID_511
Load data for caliber ".357 Auto Magnum"
The .357 Auto Magnum is a wildcat cartridge that is derived from the .357 Magnum. It is essentially a .357 Magnum cartridge that has been necked down to accept a 9mm bullet. This cartridge was designed to be used in a semi-automatic pistol, but it is not a standardized cartridge and is not commonly produced by ammunition manufacturers.

The .357 Auto Magnum has similar ballistics to the .357 Magnum cartridge, but with a smaller bullet diameter. It is not widely used or recognized, and its use may be limited due to the lack of standardized production and availability of ammunition.

You find .357 Auto Magnum 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: .357 Auto Magnum
Cartridge Type: Pistol/Revolver
Bullet Diameter: 0.358 '' | 9.09 mm
Primer Size: Small Pistol Magnum (SPM)
Max. Case Length (l3):1.3'' | 32.99 mm
Max .Cartridge Length / OAL:1.6'' | 40.64 mm
Maximum Standardized Pressure:36985.2 psi | 2550 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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