The .22 Winchester Automatic cartridge was designed for their Model 1903 autoloading rifle (discontinued in 1932). Ammo was produced into the 1970's. Remington's .22 Automatic appeared in their Model 16 autoloader. That rifle was discontinued in 1928, and the ammunition was not loaded after the Second World War. Although similar, these two cartridges differ dimensionally and are not interchangeable.