Everything would depend on the condition of the gun and especially the barrels. Under no circumstances would I fire 10 gauge magnum shells in a 80 year old gun. There are experts on this forum who could advise you as to the proper RST or hand loads. What grade is your Parker and what type of steel is indicated on the top rib? You should have the gun checked by a competent gunsmith before firing anything 10 gauge.

Best Regards, George


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