King, I'll wager that the Parker, the A&N, the Sterlingworth and the Elsie were all fed a lot stiffer stuff than 9,060 psi long before they came to you. 9,060 is certainly not a mild load but is a reasonable load for all but the Francotte. I have a 1898 Parker DH on a #2 frame with Titanic fluid steel barrels which I shoot "off the shelf" ammo in with no ill effects.

Dean