This is my first time ever reloading, and I'm sizing the new brass one time before beginning. I'm using .357 magnum starline brass, Lee 3-die carbide dies.
1. What is this from? I would assume the die is dirty but I am just making sure
2. If that's what it is, how do I actually clean the die? Do I need to take the nut off at the top? What cleaning agent do I use?
3. Do I have to size all these cases again to fix it, or can I just load them up and then resize them the next go round after I fire them?
Lesson #1 learned.......... spot check things very often. I planned to inspect every case before priming, because I thought little could go wrong here. I thought wrong, and I think I did 100+ like this.