Larry;
I fully agree that as long as the same ballistics are kept I seriously doubt the shells mentioned will jump into a dangerous territory even for old guns. Obviously they have to be kept within SAAMI standards but that isn't what we are concerned about here.
The point is thouh I think we need to be careful about listing pressures in absolute PSI which are not measured with PE gages. Crusher pressures, when taken, are now listed a LUP rather than PSI. Perhaps this pressure recorded by strain gage should be listed as 5950 SGP rather than PSI. As mentioned in another recent thread we need to be "Extremely Careful" about generalizing someone into trouble. That 5950 "May" be extremely close to an actual 5950 PSI by a PE gage, but I don't really think we have a guarantee of it.