Frank, the only way your going to figure out where the gun shoots is to pattern it. You say you have a high average with your Beretta so pattern your Beretta and adjust the Parker to match the POI. Or, if you can, go to your trap club, lock the trap on straight away and shoot from post 3. Adjust your comb height till you are centering the target. You didn't say what the dimensions of the comb/heel was. From the looks of the stock, the dimensions look low.
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