This has been covered many times here . Parker recommended service load pressures, proof load pressures and recommended charges are published in The Parker Story .
Pressures for test to destruction were published by Sherman Bell in the Double Gun Journal .
Modern loads is meaningless. Many commercially available cartridges today are suitable . Some such as Prairie Storm exceed recommended pressures.
Here are Parker recommended loads expressed in drams of powder and ounces of shot. Powder loads can be converted to drams equivalent.
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