I have been derimming a bunch of 22 mag cases for 6mm jackets. I sorted them by manufacturer. About a quarter of the CCI cases are nickel plated or at least I assume that because they are silver in color. Are these useable as jackets? I am not going to use them unless someone can show me that they are OK. They come out of the derim die at 0.2415 so that makes me happy. Out of a couple hundred, I had two come out a little bit short. They were easily spotted. You can see about an eighth of an inch on the end where the rim was ironed out. The 2 short ones were about half that. Something else to watch for.
Bob