Without looking up the specifics on Win 572 may I sugggest finding some CB 1075-20 wads and loading 3/4oz shot. You'll get a slight increase in velocity, a decrease in pressure and you won't notice a difference in performance other than less recoil. But your Parker should be able to handle your current load with no problem. Wads have little effect on pressure.
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Wag more- Bark less.
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