Model 1910 Winchester was chambered for the .401 Winchester Self-Loading cartridge, a long, straight, semi-rimmed monster. They were popular with some hunters and with police for a number of years, these and the (related) 1907 in .351 Self-Loading. The French bought a batch of 1907s n the Great War, then another batch in the '20s when they were trying to work out advanced tactics to accommodate the semi-auto rifles they wanted to build. Small quantities were used by other countries, notably of the 1907.
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