The Ross Rifle Co. Mk III is a canada-made straight-pull rifle chambered in .303 British, introduced in 1910. Primary use: military, sport. Type: Rifle Action: Straight-Pull Caliber: .303 British Capacity: 5 Year introduced: 1910, Canada Weight: 104 oz Overall length: 43.5" Status: Discontinued Military use: Yes Intended use: military, sport