My comments on action strength deal with thrust not pressure. The significants of pressure however is that the cartridge when fired, is in effect a piston of x diameter and y pressure and the thrust is a multiple of the two.
Looking at my Lefever, it is not an action that I would want to subject to very high thrust. Perhaps I am just predjudiced by I guess that I feel that a lump with a notch in it, held down by a sliding bolt is much stronger than a top rib extension with a notch etc.
The counter point I guess is that about 1/2 of the thrust perhaps more would be taken by the hinge pin and that on a Lefever is similar in strength to many other shotguns
In terms of working pressure, I think that the locking mechanism on Lefevers survived into the smokeless era hence my speculation about working pressures on a 12 guage smokeless shell.
cheers Doug
