It would seem so. Most any pressure under a max of 8000/9000 was the load for the guns originally.
Just make certain that the barrel walls are of a thickness that is acceptable and not just honed out to look good but are thin.
Best and Merry Christmas.
John


Humble member of the League of Extraodinary Gentlemen (LEG). Joined 14 March, 2006. Member #1.