I've seen where Walther 9mms have choked with steel cased ammo that had a coating.
The chamber was warm from a fairly long string and the coating was adhering to the chamber area.
After slowing down the rate of fire, the firearm functioned correctly.
"A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed."
Life Member NRA
Life Member NAHC
Former President of the ECPT (Eifel Combat Pistol Team)