.303 British

Reloading data for .303 British cartridges and specifications for cases and loads in this caliber.
Product number: CID_387
Load data for caliber ".303 British"
The .303 British is a popular round developed by the British military in the late 19th century. This cartridge was one of the most widely used rounds in some of the most important conflicts in modern history and is still well known today for its reliability and effective performance.

The .303 British is well-known for its excellent knockdown power, making it an ethical choice for hunting large game animals at extended ranges. Additionally, this caliber has proven to be a popular choice among target shooters due to its robust construction and reliable accuracy potential.

You find .303 British 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: .303 British
Cartridge Type: Rimmed
Bullet Diameter: 0.314 '' | 7.98 mm
Primer Size: Large Rifle (LR)
Max. Case Length (l3):2.21'' | 56.21 mm
Max .Cartridge Length / OAL:3.08'' | 78.1 mm
Maximum Standardized Pressure:52939.6 psi | 3650 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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