I was surprised at Hornady's response.
Looks like kaboom reports started last fall with some up in to this summer. Seen a mention it seems limited to certain lots of 55gr fmj 5.56, but that seems to be via 3rd party review of reported events.
Scratch that certain lots part and that reminded me of 1168's experience. Read the Diemaco with Frontier kaboom again and the main/only person making the only a few lots claim doesn't seem to be a very credible source.