I'm familiar with the one incident that spawned this urban myth. It involved a handloader trying to make a .40S&W hit the max pressure of the .10mm Auto. I belive that there was a "budget" after market barrel involved as well, possibly in an attempt to convert a 9mm to .40SW, but I'm not as possitive of that part of the incident. It has never been mentioned, but I also would not be suprised if there was a barrel obstruction that was never detected. In any case, the overpressure is confirmed, and there has only been that one confirmed and documented case.

Also I have witness, not been told, at least five incidents with Glock pistols chambered for the 40S&W round.