The Parker repro barrels with shoot any current factory load safely.I think the max load for the 3" 20 is 13/8 oz of shot and 31/2 dram of powder.As others have said,it will kick you out from under your hat and pattern horribly.The 3" 20 is also a slow load that throws a long shot string.The gun can handle the max load,but you will hit more and kill more with a 7/8 oz load.
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