I bought a new barrel and made a chamber cast.
Here's how it looks. Any idea of what caused this? The pictures are of opposite sides of the chamber cast.
I have an idea of what caused this, but would like to hear from some of you guys who have more experience.
BTW, I sent the barrel back and got a full refund. I'm not trying to flame a vendor. Everyone makes mistakes and I'm figuring this was an isolated incident.