I reread my post and found a major mistake. If going from fiber to plastic go DOWN 10% with your powder charge, not up. Back then plastic wads were new and the reloading data was with fiber wads. So I pick a mild load and go up one grain if using fiber wads.
Milton is right, a hard card on top of the cushion wad was even recommended in the reprint of a 1908 Sears catalog. They claimed it helped patterns because the shot wouldn't stick to the soft cushion wad.
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Paul Harm
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