The fixation here seems to be strictly on the effect of pressure on the barrels.....has anyone thought about what the effect 9k psi has on the action, locking bolt, and joint?

I'm by no means a gunsmith or an engineer, but I would imagine if the barrels are sound (wall thickness, condition, etc) 9k psi isn't going to be a cause for much concern, but I would be concerned for the guns action, locking mechanisms, jointing etc. on a gun that is pushing 100+ years, or in my case a gun pushing 134 years old, I would keep the pressure down to prevent excessive wear the metal on metal joints. 9k seems to be a bit much for my taste, I much prefer to keep pressures in the 5 to 6k range.

Dustin