Parker and other makers drew no distinction for strength between fluid steel and pattern welded steel barrels. I don't either.
I suggest you study the SAAMI specifications, that will tell you what the maximum
chamber pressure that factory ammo is supposed to generate. Without reviewing again, I think it's 11,500 for 2 3/4" 12ga shells, such as magnum loads.
TPS in the barrels and chambers chapter has a table showing service and proof loads for Parkers of various gauges and chamber lengths. If I remember correctly , 12 ga 2 5/8 chambers are 10,200 psi service load maximum . These are for guns in as new barrel condition. I follow these loads. There are many commercial loads that meet the Parker service load limit and many that do not. So yes, a person can shoot modern loads, but not other modern loads without exceeding design standards.
Suggest you study both documents.
Of course a person can always shoot lesser loads to save shoulders, hinge joints, and stocks.
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