John,
Your concern should be focused on the minimum barrel wall thicknesses from chamber to muzzle. A deep pit just ahead of the chamber could be very dangerous even with loads of less than 6000 PSI. Further toward the muzzle (inches past where your forward hand would grasp the gun) a pit might burst but would be functionally the same as a barrel port venting gass in direction perpendicular to the bore. While ruining the value of the barrels and thus the gun, a barrel hole very close to the muzzle probably would not remove your fingers upon firing.
Who was the gunsmith who inspected it previously? No offense, but is he a competent "double gunsmith"? If so, maybe send it back for a checkup. If you have any questions, find a smith who specializes in old SxS's.
PS: Of course always wear good safety glasses when shoot these old guns!
Respectfully,
Mark
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