Eject or extract?
Extraction issues with some makes of live rounds is common. Take a look at a live round that has been chambered. You will probably see rifling marks engraved on the bullet. Different bullet shapes fit tight enough that the the extractor has trouble pulling the bullet back out of the rifling.
It's a nice tight chamber that helps give the CZ's their accuracy. Don't know if it's a match chamber but pretty close.