CAUTION: The following post includes loading data beyond currently published maximums for this cartridge. USE AT YOUR OWN RISK. Neither the writer, The High Road, nor the staff of THR assume any liability for any damage or injury resulting from use of this information.
1) In the category of gun that is stronger than the brass, I do not care what the pressure is in PSI or in CUP. I do not care what was the length of duration of pressure.
I simply work up until the brass takes some damage, and then back off a safety margin so I know I will not have brass failure when a shot is important.
2) In the category of gun that is weaker than the brass, I can Super Glue on a strain gauge and measure pressure, or follow a load book recipe for that cartridge.
What does it all mean?
Most of the time I don't care what is the pressure in psi or cup, but I care what are the effects of pressure.