I awlays found the Polywad SpreadR loads to be the best I ever shot. I still have almost a case of them which I save for my daughter to use in an essentially cylinder bore RBL 28 ga. It is .002 and .008 in the 30" barrels. These loads make the left barrel shoot about 20% more open.
I have always found the plastic x type wad much better than cardboard. I buy into the theory that it compresses in the forcing cone and choke and then springs outward to spead the shot. I have always had much better luck than with the cardboard ones.
When I am out of the PolyWad loads, I will use a plastic X over a plastic gas seal/overshot wad with no shot wrapper. I believe this will give the best radial dispersion. Shot will be soft lead or low quality.
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