I use a 124 pc boolit in a 9mm CZ 75b. I shoot some USPSA where a lot of rounds are fired quickly. Sometimes to unload the pistol the slide needs to be slammed against a hard object to open the chamber. I have shortened the OAL where they pass the plunk test.
Can the pc coating melt and glue the round in the chamber?
I have tried to eliminate every other possibility.