Question on gunfit. Shooting two different guns (Beretta Prevail, 12 ga. And a Benelli 20 ga. Super Sport ) from 15 yards at a patterning board I used your recommendation of 5 shots. The results from both guns is a pattern of nearly 100% above the center of the circle. Neither right nor left. Centered. I would very much appreciate your recommendation on how to lower the pattern.
Appreciate all that you do,
The first thing to remember is that the point of impact will move in the same direction that you move the stock. If you want to lower the point of impact you want to lower the stock.
You’re dealing with two very different guns. The Benelli Super Sport has a shim adjustable stock and it will be very easy to lower it by simply replacing the shims that space between the head of the stock and the rear of the receiver. Your instruction manual should show you how to do that.
The Beretta Prevail over and under presents a different problem. It does not have an easily adjustable stock. You will have to go to a qualified stock maker or woodworker to have the stock sanded down to lower the point of impact. The best way to do that on an over and under is to simply sand the comb down a little bit then immediately test the pattern point of impact and see if you arrived at what you want. If not sand a little more and test again. Remember the old rule to measure twice cut once. Sand a little and test and do it again until it’s right. That way you won’t sand off too much.
As to how much to lower the stocks I would do that by testing on the Benelli first with its simple adjustment shims. The old formula for stock adjustment was that at 16 yards distance one sixteenth of an inch of stock adjustment equals one inch of adjustment on the pattern plate. I still like to do it by making the adjustment a little bit at a time and testing and then move it a little more and retest until you get it right. That way there’s no big mistake.