There are non Parker cheap barrels made of rolled steel edge welded and printed with a fake Damascus pattern. Don't shoot those. All the early lifter action Parker barrels I have seen look pretty stout and have ample wall thickness, and well they should because a common practice was to cram as much black powder in the hull as possible and blast away. I don't know about the back action lifters and hinge lock early Meriden Mfg guns.
People commonly say " low pressure " without defining low pressure. To me , assuming unaltered barrels, appropriate pressure remains Parker service loads as made. Some throw out 6000 psi for a 12 ga based upon British loads, but those are for thin walled 2" guns which are a long way from Parker stout. Others throw out 8500psi ( 12ga) without any apparent documentary justification . So I don't know what folks mean when they say low pressure. To me, I am more concerned with low recoil for target loads than low pressure, so that means 1 oz or less and maybe 1100 fps for a 12. Lots of confusion between low recoil and low pressure.
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