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Bruce what is the date of the Parker Service and Proof load table in the TPS? If I recall correctly it lists pressures for both 3" 12ga and 20ga guns/shells which suggests to me it applies to guns made in the mid to late 1920's and forward.
Of course I believe every fluid steel Parker made has and will shoot every factory shell in the correct chamber size without problem. Now whether that is good for 70 to 120 year old guns is another question.
The Following User Says Thank You to Pete Lester For Your Post: