I too have been on reloading forums since '98. This discussion about primer tube blow-ups happens a lot. Usually it boils down to someone being stupid.
One I remember was some dope replacing the very light weight follower in a dillon 650 priming system with a piece of bronze rod long enough to allow all 100 primers feed. He said he was having problems with them dropping with the original follower. What happened? He lost his grip on that heavy rod, dropped it on a half full primer supply tube.
BOOM!
I'd bet that most of the others are from some gorilla getting mad at some hang-up on the machine, then slamming the op handle. IF that hang-up was a primer going in wrong, it could trigger an explosion.
I never bought into the myth of there being primer "dust" present in a priming system. The primer pellet goes into the cup wet, with a paper disc on top of it. The paper disc is to keep the wet pellet from sticking to the punch. Then the anvil is placed on top of the disc. Finally is a layer of wet lacquer,(a type of paint), a sealer.
Now just how does that primer pellet that goes in wet and is formed perfectly to the bottom of the cup, going to form dust?
The way primers are packaged is to prevent them from touching. It's also to minimize vibration in transit.
This discussion came up once on another forum. I decided to prove or disprove whether dust could be generated from a box of primers (100). Now what could provide vibration??¿¿ How about taping said box of primers to the lid of my FA vib tumbler? Viola! How long, well how about 3 hours, what it would take to do a batch of brass. Primers were inspected with a 20X magnifier before and after vibrating. No sign of dust. Ummmm, of yeah those were Winchester large rifle primers, standard, not magnum.
No, I didn't do any other types or manufactures. Visual inspection of wolf primers makes me think maybe they've skipped the lacquer sealer. maybe I should repeat my test with them?
Clean as a whistle!