The .35 Winchester Self-Loading (also called .35SL, .35SLR, or .35WSL) is an American rifle cartridge. Winchester introduced the .32SL and .35SL in the Winchester '05 self-loading rifle as a centerfire cartridge version of the Winchester '03. The .35SL proved popular at first with the general public as a short-range deer and black bear hunting cartridge, but was soon superseded by the introduction of the more powerful .351SL in the Winchester '07.