JMHO, but from past experience and from reading such books as a Sears 1905 catalog [ of all things ] , I would recommend anything possible to be put under the shot. Most anything such as wads, rice, beans, plastic, etc, is all lighter than lead and will stay behind it after the shot leaves the barrel. If put in front of it, the shot will have to go around it and it COULD disrupt the pattern. I found just a thicker OS card made a difference. And it's cheaper if using wads to put one cushion wad in instead of two or three OP cards.
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Paul Harm
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