Remember guys, any steel case that's coated might pose a problem. This stuff is coated to keep the cases from rusting. The coating will come off with enough heat. Think of the chamber as a small furnace, it will get hot enough in rapid fire to melt that coating off. Once melted it has to go somewhere, usually sticking to the chamber wall.
Ok, I'm a Chicago cop who can't get ammunition or high capacity mags shipped to him. This has been a selective process. Some companies will ship others won't. When I've made inquiry has to why, the replies vary. doesn't have to do with the law. Certain companies just don't care. Shame on you, those that give me the excuse, " that's the way our system works".