Quick Answer
To fit an over-under shotgun to your frame, consider your comfort level with the gun's weight and balance point, then adjust the stock's length of pull, drop at comb, and cast to suit your individual needs.
Stock Length of Pull Adjustment
Adjusting the length of pull on an over-under shotgun is crucial for a comfortable shooting experience. Most stock lengths range from 13.5 to 15 inches. To adjust the length of pull, use a stock shim kit or an adjustable stock. Start with a shim thickness of 1/8 inch and increment by 1/16 inch until you achieve a comfortable fit. For example, if your stock is 14 inches and you prefer a 14.25-inch length of pull, add two shims (1/8 inch + 1/16 inch).
Drop at Comb Adjustment
The drop at comb affects the alignment of the shotgun’s barrels with your eye line. Aim for a drop at comb that places the top of the rib 1.5 to 2 inches below your eye line when standing upright. To adjust the drop, use a stock shim or an adjustable stock. For example, if your stock has a drop of 1.25 inches and you prefer 1.75 inches, add a 0.5-inch shim.
Cast Adjustment and Choke Selection
Cast refers to the direction the shotgun’s barrels swing when shouldered. A right-hand choke typically has a 0-degree or 2-degree cast for a right-handed shooter. To adjust the cast, use a stock shim or an adjustable stock. For upland hunting, use a choke with a 2- to 4-inch range, such as the Beretta Optima 12 gauge, which offers 4 chokes in the 2- to 4-inch range (SK, IC, M, F).
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