I was looking through some of my old Speer manuals especially number 11 from 1987. When this one was printed they were still using 46000 cup as max pressure for the round. In the early 1990s Saami set about
35000 psi limit for 357 which I know is not convertible to cup. Anyway I was comparing load data to a current manual and noticed a significant decrease in many loads. I am sure many of the old loads at 46000 cup that I and many others used then without problems would be over the 35000 psi limit if measured now . No wonder I can now have a Smith J frame 357 mag! No doubt the 357 mag was down graded , all you have to do is look at older data. I guess it’s better for my Smith k frame magnums as well but not too worried about my n frames with older data.
Dogdoc