40SW and 9mm are essentially the same pressure.
Good point, 35K psi, give or take.
Contrary to some here, I don't doubt certain makers ability to make hardware that can stand up to a .40. (More powder, heavier bullet, more recoil)
What I doubt is the ability of most shooters shoot these tiny guns in .40 with any amount of speed and accuracy.
During the darkest days of the 2013 panic, I could always get my hands on PM40s, Kimber Solo .40, and yes even Shield .40s. The G27 was one of their last guns to dry up from their normal plentiful numbers. I can't tell you how many relatively new shooters who I've either given followup lessons to, or simply answered their questions when they were in the lane next to me having trouble with a .40. Often their grip is wrong, their stance is wrong, and they are not yet conditioned to much recoil.
I hand them my Glock 34 with my powder puff 9mm reloads and they get a smile on their face. All of a sudden they are kindof hitting the target. It will take more than a few rounds from a friendly gun to repair the flinch they've developed. But at least its on the mend. Many of these shooters are AFRAID of their little tiny micro .40s.
I'm not necessarily knocking the caliber. In a Gen 4 G22 its a great shooting round. In an STi edge, it shoots great. In a PM40 or a .40 Shield or G27 it defintiely does not.
Don