I still think the .40 is loaded up to the max from the factory, and by reloaders. Most .40 handguns are adaptations of existing 9mm's meaning thinner barrels. Add in dirty bores, temperature swings, shorter rounds from repeated chamberings, and its easy to see how pressures can jump and and kb's happen. If the ammo was loaded down a bit, say to an average of 30k or so, most of these problems could be avoided.