Winchester's semi-automatic sporting rifle in .351 Winchester Self-Loading, one of the first commercially successful semi-automatic rifles in America. The proprietary .351 WSL cartridge provided meaningful hunting ballistics in a semi-automatic platform. Type: Rifle Action: Semi-Automatic Caliber: .351 Win SL Capacity: 5 Year introduced: 1907, USA Weight: 7.75 oz Overall length: 39.5" Status: Discontinued Intended use: Hunting, Collecting