Ross rifle
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The Ross rifle is a straight-pull bolt action rifle chambered in .303 British that was produced in Canada from 1903 until 1918.
Ross rifle
Ross rifle in the Royal Canadian Regiment Museum in London, Ontario
Mechanism comparison between Ross Mk III (1910) and Mk II** (1907)
38th Battalion CEF armed with the Ross on Queen Street, City of Hamilton, Bermuda in 1915
.303 British
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The .303 British or 7.7×56mmR, is a .303-inch (7.7 mm) calibre rimmed tapered rifle cartridge. The .303 inch bore diameter is measured between rifling lands as is the common practice in Europe which follows the traditional black powder convention.
Left to right: .303 British, 6.5×50mmSR Arisaka and .30-06 Springfield ballistic tip ammunition
Longitudinal section of Mk VI ammunition 1904, showing the round nose bullet
Longitudinal section of Mk VII ammunition circa 1915, showing the "tail heavy" design
.303 British Cartridge (Mk VII), manufactured by CAC in 1945