That sounds kind of hot from a Krag action, too. Don't dee how that could be under 40,000 psi. There is an old thread somewhere on Gunboards about a Rolling Block blowup somewwhere in Europe. They weren't sure exactly what load blew it, the shooter was killed by a piece of the breech block, and he had a variety of .50 cal cartridges laying on the bench beside him. Ranged from .50-70 and the correct 12.? MMSwedish, up to .500 nitro express! Guess he was just seeing what would chamber and fire.