The problem with a 17K "proof load" is that the working pressures of damascus barrels were never that high. It is the equivalent of using a 40K proof load in a modern gun. You will blow the barrels. If memory serves, around 1907 the Belgians increased their proof loads to 1.5x the service pressure. Which would put a proof load around 10K or 11K.
Ithaca continued to decry the dangers of damascus.
The advantage of damascus was this type of burst.
It was considered safer than a longitudially welded fluid steel barrel. Which would behave like this under extreme pressures.
Of course, none of use want to experience either one up close and personal. That is why any older gun whether forge welded or fluid should be properly inspected and measured. It should only be shot using loads for which it was designed. For forge welded barrels, I draw the line at 7,000 psi.
Pete
