Bought 40 cal shield in december.
used some old ammo, maybe 15 years old Federal, Hyra shock.
blew up on the 4th shot.
I have the box of ammo it came out of.
I sent them the gun, the head stamp I found on the ground and the brass was still in the gun. They inspected it at their lab.
Federal had some issues with their early .40S&W ammo leading to a recall and some changes to later batches.
That's been a long time ago, but contacting Federal/ATK would probably still be worth a shot.