Ross
There appears that it is very rare, it would be of them only 1.500 manufactured.
Ross Mark III
In the summer of 1911 Canadian army introduced the Mark III Ross rifle, also known as Model 1910. This rifle was the principal arm of the Canadian corps in Europe during the First World War, and it turned out as a complete failure. Despite the modified magazine which could be loaded from stripper clips, the Ross Mark III rifle was too sensitive for dirt and fouling, it lacked proper initial extraction to handle dirty ammunition. The overly complicated bolt system of all Marks of the rifle did not helped the proper maintenance in the field, which also compromised reliability
On the other hand, most Ross rifles were inherently accurate and served well as a sported and even match rifles.
Calibre: .303 British (7.7x56R mm)