I have one old Beretta with Krupp barrels and have had two gunsmithes say they will handle any load made today short of the steel and heavy shot. I don't remember all the barrel thickness info but these are from 1930 and have very heavy wall thickness so I have been told. I shot 1 3/8oz. Bismuth and other than recoil it is doing well. Have a good smith you trust check them out. Krupp did have different quality barrel material. I was told the three ring steel was their highest quality. The barrels are marked with three interconnected rings.
Best,
Ron
