Rimmed bottlenecked case with flat nosed lead bullet.
This is based on a necked down .44/40 case, and utilises a .40 calibre bullet. It was introduced by Winchester c.1880 for their Model 1873 lever action rifle, and was advertised as being suitable for small game. It soon became available in Colt and Smith & Wesson revolvers. It never achieved the popularity of the .44/40 however, and in 1882 Winchester introduced an even smaller bore for the Model 1873, the .32/20, which was better adapted for the small game role.