Winchester 1894 maximum chamber pressure

[ovenpaa]

Does anyone have any thoughts on the maximum safe chamber/breech pressure a Winchester 1894 would stand? Certainly cartridges like the 30-30 run at a maximum of around 42,000 PSI however I am thinking of the .357 based wildcats.

This is purely a question for Proof as I do not want to see the poor old girl bounced off 4 walls in a London proof room so I need to specify something vaguely safe and workable.