That's what I don't get... maybe some can explain it to me.
The pressures (CUP) listed for 9mm are much higher than those for .40S&W, but everyone says that the 9mm (the cartidge itself, in ANY platform) is much less likely to KB! due to its lower pressure. How does this translate? I know it does, but I am missing a part of the equation. What is it about the .40S&W that makes it a 'higher pressure round' than the 9mm despite it's listed pressures being lower?
Is it ONLY the fact that the 9mm case is proportionally thicker the closer it gets to the case head or is there another factor?