The cold bore shift was 1/2” at 50yds which is pretty substantial. I spoke to Vudoo and they explained that their chambers are tight and when the barrel is cold, the carbon ring can cause the cold bore shift. Once the barrel is heated, the carbon ring loosens a bit and is not as noticeable. I did borescope it and the ring was pretty evident. Cleaning it with C4 eliminated the cold bore shift.
As for my CZ 457, Similar situation with my LIlja barrel. Found it even difficult to chamber rounds. I swapped it with my original CZ barrel and there was a cold bore shift but not pronounced like the Vudoo. Maybe the chamber isn’t as tight to start so not a big cold bore shift.