The historically correct chambering for the 1866 Yellowboy replica — .44-40 was the original Winchester offering for the 1866 pattern. Brass receiver, walnut, side loading gate. The most authentic Yellowboy replica available commercially. Type: Rifle Action: Lever-Action Caliber: .44-40 Winchester Capacity: 13 Year introduced: 1966, Italy Weight: 8 oz Overall length: 43" Status: Active Intended use: cowboy_action, collector, historical