Bruce - I have not used that particular recipe for 3/4 oz 20s, but the Windjammer wad with the lite load in the straightwalled RST hull may not be the best choice, regardless of what the data says. You may want to try a Federal-type wad that would be more compatible with the RST hull. Also, barrel residue with the 20 ga. 3/4oz load has not been that bad in my experience with it. RST always seems to be dirty, and loud. I'm not a fan of RST ammo for those reasons, and the fact that they are expensive.
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