Thirty years ago I wrote Tom Roster a letter asking him how I could develop a load that would in effect open up the pattern in a tightly choked Parker 20ga. He suggested cutting the petals off a plastic wad and loading as usual. The theory being the shot would scrub the barrel, slightly deform, and open up the pattern. It worked and I've been doing it ever since.
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Wag more- Bark less.
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