One thing I would do is pull a bullet from one of your loaded rounds and mic it. The 9MM is a tapered case and most 9MM expanders are designed for jacketed bullets and do not expand far enough into the case. If that is what's going on in your case you might want to buy a Lyman "M" die or something similar to expand the case and not size down your bullet when you seat it. I personally think this is one of the major causes of 9MM leading problems. As stated by previous posters the TL concept can be a problem in the 9MM although I have used it in the past successfully. Good luck.