.455 MK II

Reloading data for .455 MK II cartridges and specifications for cases and loads in this caliber.
Product number: CID_780
Load data for caliber ".455 MK II"
The .455 Mark II is a large-caliber, rimfire revolver cartridge developed in 1907 by Smith & Wesson.

It was initially used in the Webley Mark VI revolver and remained in service with British forces through World War I. It has since seen its use declined due to its low velocities and bullet weights.

You find .455 MK II 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: .455 MK II
Cartridge Type: Pistol/Revolver
Bullet Diameter: 0.455 '' | 11.56 mm
Primer Size: Small Pistol (SP)
Max. Case Length (l3):0.77'' | 19.48 mm
Max .Cartridge Length / OAL:1.26'' | 32 mm
Maximum Standardized Pressure:13053.6 psi | 900 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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