Carman Fluid Steel (no idea what that was) offered in 1908
https://books.google.com/books?id=5U...&pg=PA1139&lpg
1912
https://books.google.com/books?id=Uy...g=RA4-PA73&lpg
“Maximal Average (Service) Pressure” for 850 BAR shells is about 10,700 PSI. The Ely loads are probably less (but Ely is unlikely to tell you
) but the RSTs are about 6000 psi.
As Frank suggested, I would not use the gun with
any load until the barrels have been evaluated by someone with the expertise, equipment, and interest to do so.