Then there was a guy in the USA who had 3 rifles with leade burrs worse than mine, so despite it being thought that CZ-USA would take care of this issue they said that this bore condition was "normal and acceptable".
http://www.rimfirecentral.com/forums/showthread.php?t=709441&highlight=hope+there+isn't+a+new+trend
Page 2 post #23 for CZ-USA's response to this guy.
http://www.rimfirecentral.com/forums/showthread.php?t=706425&page=8
Page 8 post #114 for what CZ-USA actually did for him aka "not much".
So given CZ's official position that chambers such as ours are "not defective" I gave up pursuing it with them. I borrowed a reamer to try cleaning up my chamber but the pilot size was too large and it pushed up more burrs on the lands so now CZ definitely would never warranty the barrel and
I sold it as a "practice" barrel for hobby smithing.
The rifling is hammer forged then the chamber cut with a reamer. It seems CZ pushes the reamers well past their acceptable service life so they are dull and just smear the metal instead of cutting and put out barrels with terrible burrs that will never shoot well but insists they're acceptable.