Andrew, you stated that you are using square loads with 2f powder.
I have found that square loads pattern better using 1f powder. If using 2f, I back off on the powder by 10-15% and patterns improve.
You did not say whether or not the cushion wads are lubricated or dry. I lighty lube mine with bore butter which helps to keep the bp fouling soft.
I also put an overshot card on top of the cushion wad to keep shot from embedding in the cushion wad.
Hope this helps.
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