c. 1900 reported 20g pressures vary significantly
7/8 oz. 2 1/2 Dr. Eq. BULK Smokeless was 8000-10,000 psi.
7/8 oz. 2 1/2 Dr. Eq. DENSE Smokeless was 11,000 - 12,500 psi.
Up until about WWI the standard 20g load in the U.S. was 7/8 oz. with 2 1/4 Dr. Eq. Bulk or Dense Smokeless powder at 1155 fps.
As Bruce observed, assuming the barrels are without defects and with adequate wall thickness, using the load listed on the original hang tag would seem reasonable.
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