If a person uses reasonable shot and powder charges appropriate to the gauge, chamber pressure will be below or way below maximum service load pressure. Proof and service chamber pressures for Parkers are listed in TPS.
This would not include these ultra magnum loads which take advantage of the increase in proof pressure by SAAMI in the 1960s. No prairie storm black cloud artillery shells. And for 16’s , be wary of more than 1 oz at 2 3/4 Dre.
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