I had my first-ever primer tube chain-detonation just now, loading 9mm in my 1050. I felt a little crunch in the lever, so my guess is a sideways primer got popped, and somehow chain-fired the rest of the primers in the tube (fortunately only about 25).
It was loud, and destroyed the primer tube rod by shooting it out against the ceiling. The 40 cal bullet I used as a weight made a divot in the ceiling. (See last pic below. The long black mark is from the rod)
The primer tube and the primer station retaining tab are fuct. However, I felt no no debris from the explosion. I was listening to the PSTG podcast with earbuds, so that kept my ears safe.
Fortunately Mrs. CF was not home, and neighbors do not seem to have called the cops.