I have never had this happen before, and twice today today it has happened, with two different headstamps. I could feel the force of the decapping pin swaging the undersized flash hole out as I sized the case. (I did not know what it was yet) When I tried to pull the brass down out of the sizer the decapping pin stayed in the case and jammed things up nicely. I sorted out the three other same headstamp cases (only doing 15 cases, and promptly had it happen again with another headstamp. The offenders were DAG07L0718 9X19SX and S&B NONTOX 07 9X19 It pulled the decapping pin right out of the collet in my Redding sizer. I tried my Lee sizer on a couple and it swaged the hole out and then pulled out OK. You can feel the extra force it takes. I get rid of S&B brass plated steel by using a large magnet to pick them out of range brass. Now I have to look for these, as well as the occasional berdan primed case I pick up accidentally. Arghh.