Hi Mikey,
I don't know about the pressure ranges for factory shells and doubt anyone else does either but I do have info from the Hodgdon Shotshell Data Manual.
Max Pressure 2-1/2" 12,500 PSI
Max Pressure 3" 13,500 PSI
Case Head 0.535 - 0.016
Head thickness 0.063
Outside Diameter 0.462 - 0.014
These are all noted as being SAAMI specs.
Ka6otm