Mike,
It is interesting that you are concerned with the chamber. I already did a quick cal on it (I am an engineer) the barrel is 2" Dia at the breech and 1.5" at the front. Stress is relatively low in the barrel wall. with a 40,000 psi load, stress in the walls would be under 9000 psi. 40,000 psi may be too high of a load to use in it.

I am more concerned about the action and the locking mechanism.

Any more thoughts.

Jerry