I agree with Mark and Jon, and do not agree with ed. Today one can purchase factory smokeless loads that reproduce pressures for which the gun was designed and proved:
1 1/8 oz. 3 Drams Hall & Son No. 4 or Curtis & Harveys No. 4 T.S. (82 grains; somewhat similar but not equivalent to medium grain FFg) was about 6500 psi.
1 1/4 oz. 3 1/4 Drams Curtis & Harveys No. 4 T.S. was about 8500 psi.