S&W Shield .40 might not be up to the challenge

[Intercooler]

   Looks like some Kabooms ----->

  I hate blaming ammo when this also happened with a couple of factory rounds. The ammo MIGHT have contributed, but the bigger role IMO is the firearm.

http://www.glocktalk.com/forums/showthread.php?t=1519781&page=2

[DenStinett]

There has been a few articles on this
And yeah, S&W does point the finger at AMMO in every one

[Intercooler]

  Maybe The Shadow can log on and get one of those Underwood 135's to see what's there? Rapid fire with possibly an upper end round in a striker fire helps open the door.