Do I have a Brass or Chamber problem?

[Rocky Raab]

Well, it does prove that micrometers are hard to use.

T/C has often been accused of producing off-center or out-of-round chambers. It sounds as though you have another log to add to that fire.

It's also an object lesson on why rimmed rounds are much better for break-open actions. For a rimless round, the T/C extractor is under spring pressure. That allows it to be pushed down so a round can be chambered, but then snap up into the extractor groove.

But that same upward pressure very often "cocks" the round in the chamber. It doesn't do much for accuracy, and (as we've seen here) it can also result in crooked, egg-shaped brass after firing. It's worse if the chamber itself is off-round or oversized.

If it were my barrel, I'd trade it off for a better one. Preferably one with a rim.