Tom, the Parker standard 12 ga load for testing patterns was 1 1/8 oz at 3 drams, equivalent to about 1200fps. It didn't matter if it was fluid steel or Damascus, Parker treated them the same,.
TPS contains service and proof load pressures for Parkers, which were the SAAMI loads of the time.
Parkers were made to shoot stout loads. Shooting light chamber pressure or light recoil loads is a choice, not a necessity.
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