I shot a .530 ball in a 20 ga. plastic wad that shot very well in a parker vhe, but would not group shots in my other 20 ga.s. I think you should start with 1 mold and experment a little. I would also make sure that ball inside wad will slip in the muzzle. After all we don't want to make a shooter into a wall hanger. Procede carefully in any case. Dave
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