.280 Riml. N.E. Ross

Reloading data for .280 Riml. N.E. Ross cartridges and specifications for cases and loads in this caliber.
Product number: CID_290
Load data for caliber ".280 Riml. N.E. Ross"
The .280 Ross, also known as the .280 Rimless Nitro Express, stands as a notable chapter in the history of firearms. Introduced in 1906 by Canadian firearm designer Charles Ross, this cartridge was developed to offer a balanced alternative between the .275 Rigby and the .303 British cartridges. Featuring a rimless design, the .280 Ross facilitates smooth cycling in bolt-action rifles, enhancing reliability.

Specifications of the .280 Ross include a bullet diameter of .288 inches, a case length of 2.8 inches, and a shoulder angle of 35 degrees. Originally loaded with a 140-grain spitzer bullet, the cartridge achieved velocities of around 2,700 feet per second, showcasing a significant power factor for its era.

Despite its promising attributes, the .280 Ross faced challenges in gaining widespread military adoption, particularly during World War I when the British military favored the .303 British cartridge. Additionally, concerns were raised about the recoil generated by the .280 Ross, leading to doubts about its suitability for military applications.

Nevertheless, the cartridge found a niche in the civilian market, gaining popularity among big-game hunters due to its flat trajectory and impressive accuracy. The .280 Ross became renowned for its performance in hunting scenarios, although it did not achieve the military recognition its capabilities suggested.

In terms of historical significance, the .280 Ross has garnered renewed interest among firearm enthusiasts and collectors. Its unique design, coupled with its ballistic performance, makes it a sought-after cartridge for those fascinated by the evolution of firearms technology.

Caliber: .280 Riml. N.E. Ross
Cartridge Type: Rimless
Bullet Diameter: 0.287 '' | 7.29 mm
Primer Size: Large Rifle Magnum (LRM)
Max. Case Length (l3):2.61'' | 66.29 mm
Max .Cartridge Length / OAL:3.46'' | 87.88 mm
Maximum Standardized Pressure:47138 psi | 3250 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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