Polished the markings out only half hour before the jam.
Not sure that Carbide and Tungsten Carbide are one in the same.
Removed stuck case and inspected using the carbide ring by touch and it feels like it is cracked it several places.
Is it possible that I had just the exact amount of water in my ultrasonic cleaner to hit a resonant frequency in the carbide to cause it to fracture?
Believe what you want, I guess. Or do your own homework.
Got a magnifying glass and a decent light. Get a good close look at it that way.
If you can see a crack, it's done like dinner. Carbide is hard as heck, but brittle too. If you rammed a case in too far or otherwise strained it enough to swell the steel of the die a wee bit, that could be all it took to break the carbide ring in the die. Buy a new one, that's all she wrote.
Could be there was something stuck to a case, maybe a badly set up press, or just a random blowout caused by one too many stacked up tolerances when the die was made. Every maker throws a few duds, or we'd never get to hear about how good some company's warranty service is, would we.
Lee dies are about as cheap as cheap gets, when it comes down to prices. Whether they give value for your money, I'll leave for you to decide, but if it was use/abuse that caused the breakage, you'd be as pissed, and as broken, with anyone else's dies too, like as not.
Broken carbide ring= fishing weight.
Trash it and move on.
Cheers
Trev