Cast Off - An offset of a gun stock to the right, so that the line of sight aligns comfortably with the right eye while the butt of the stock rests comfortably on the right shoulder. Almost all right-handed shooters benefit from a little castoff and most custom built guns are made this way. The only question is how much. The castoff of a gun is about right when, with the gun comfortably mounted, the front bead lines up to your eye with the center of the standing breech. Cast-Off 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).
A stock offset to the left, benefitting shooting from the left shoulder, is said to be Cast On. See 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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