Calvin,
I have used the "X" spreader from BPI in 10 gauge target loads with great success!
Another spreader insert can me made by cutting a plastic drinking straw to the length of the shot column and inserting it.
Any soft plastic in the center of the shot column will compress and subsequently de-compress (correct me if there is a better word) when it leaves the barrel. I would guess the thicker the plastic (within reason) the better.
Evidently it doesn't take much pressure pushing outboard to cause the pattern to spread.
Mark
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