This cartridge is listed in Foster (1952): Winchester’s “Forgotten” Cartridges, 1866-1900, but is is the same as the standard 11.15x60R M.71 Mauser. It was manufactured for a short period by Winchester, who after the 1873 Army Trials began manufacturing ammunition for various foreign military powers, including China. W.H.B Smith in his excellent book, Mauser Rifles and Pistols mentions that Mauser sold 26,000 of their M71’s to China in 1876.
