I have pattern tested both Polywad and RST spreaders in 20 ga some years ago. The pattern work was done with several different guns and the results were fairly consistent. The polywads were passable but barely and the RST's were abysmal. I have no experience with 12 ga, however and the results could be entirely different. Changes to their loads may have also changed since I did the pattern work. The bottom line, if you go the spreader route then a trip to the pattern board is in order.
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