Cast On 

Cast On - An offset of a gun stock to the left, so that the line of sight aligns comfortably with the left eye while the butt of the stock rests comfortably on the left shoulder. Almost all left-handed shooters benefit from a little cast-on and most guns custom built for left-handed shooters are made this way. The only question is how much. The cast-on of a gun is about correct when, with the gun comfortably mounted, the front bead lines up with the center of the standing breech. Cast-On is measured by the distance between Line X - X, (the centerline of the gun as extended along the center of the rib rearwards) and point Y (the centerline of the stock at the butt).         See also: Eye Dominance.

Production guns are normally manufactured with no cast either way---so that the right handed and left handed can shoot them equally poorly. 


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