Make sure you don't use super clean brass on the large expander plug or it might stick and rip the rim off! The cases need wax or neck lube or you have to have some method from getting clean metal on metal.
I bought some stainless pin cleaned brass once and ooooh it was so shiny inside and out. I had to wash them in some heavy wash and wax and only rinse like 98% of the soap off so it left some visible residue. Others I used some far diluted alox and a q tip and lubed all the interiors of the case necks. Now I just leave my 9mm cases relatively grimy but still segregate by headstamp.