Get some Winchester 1 3/4 or 1 7/8 oz wads that they use in thier big magnum 3" shells and cut the petals back to the same size as 7/8 oz/ pick a lower speed load say 1200fps back the powder off a bit, see how it goes and work it up from there.

I load 2 1/2 shells by using 1 1/4 wads cut back to 7/8 oz petal lenght and it works a treat

Hotrack

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