I have seen at least one die that wouldnt size far enough down the case to work. I fixed it by turning about .oo5" off the bottom of the die. You can do the same thing by sanding the top of the shellholder on a flat surface. I suggested this on here once before and several people freaked out, but if you think about it, all you need to do after altering the length of the die or the shellholder is to re-adjust your sizer. If in fact thats the problem, and I think it is, your die isnt going far enough now, so shortening it will move it up and into the proper position to size the entire case.