Cooper Arms Model 54 Classic in 338 Winchester Magnum. Cooper offers the 338 Win Mag in the Model 54 long action as a more compact alternative to the dedicated Model 56 magnum platform. The Model 54 in 338 Win Mag is slightly shorter and lighter than the Model 56 version, trading some action smoothness for reduced overall length. Classic oil-finish walnut and sub-half-MOA guarantee. Type: Rifle Action: Bolt-Action Caliber: 338 Winchester Magnum Capacity: 1 Year introduced: 1999, USA Weight: 68 oz Overall length: 44.5" Status: Active Intended use: hunting, dangerous game