.280 Ross
| .280 Ross | ||||||||||||||||||||
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.280 Ross cartridge (right) next to the .303 British. | ||||||||||||||||||||
| Type | Rifle | |||||||||||||||||||
| Place of origin | Canada | |||||||||||||||||||
| Service history | ||||||||||||||||||||
| In service | Canada | |||||||||||||||||||
| Production history | ||||||||||||||||||||
| Designer | F.W. Jones | |||||||||||||||||||
| Designed | 1906 | |||||||||||||||||||
| Manufacturer | Ross Rifle Company | |||||||||||||||||||
| Variants | 280 Flanged (280 Lancaster) | |||||||||||||||||||
| Specifications | ||||||||||||||||||||
| Case type | Semi-rimmed, bottleneck | |||||||||||||||||||
| Bullet diameter | .287 in (7.3 mm) | |||||||||||||||||||
| Neck diameter | .317 in (8.1 mm) | |||||||||||||||||||
| Shoulder diameter | .404 in (10.3 mm) | |||||||||||||||||||
| Base diameter | .534 in (13.6 mm) | |||||||||||||||||||
| Rim diameter | .556 in (14.1 mm) | |||||||||||||||||||
| Case length | 2.59 in (66 mm) | |||||||||||||||||||
| Overall length | 3.50 in (89 mm) | |||||||||||||||||||
| Case capacity | 76 gr H2O (4.9 cm3) | |||||||||||||||||||
| Primer type | Berdan #59 | |||||||||||||||||||
| Maximum pressure | 47,200 psi (325 MPa) | |||||||||||||||||||
| Ballistic performance | ||||||||||||||||||||
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| Source(s): "Cartridges of the World" | ||||||||||||||||||||
The .280 Ross, also known as the .280 Nitro, .280 Rimless Nitro Express Ross (CIP) and .280 Rimless cartridge, is an approximately 7mm bullet diameter rifle round developed in Canada by F.W. Jones as a consultant to Sir Charles Ross, 9th Baronet, and his Ross Rifle Company of Quebec, Canada for use as a Canadian military cartridge as a replacement for the .303 British, and in a civilianised and sporterised version of his controversial Mark II and Mk III Ross rifle, and first commercially produced by Eley Brothers of London, England, in late 1907.