RHOTWING, Thanks for the clarification on type of die used. What you experienced is due (in part) to the bushing die pushing irregularities of the case wall to the interior of the neck. The expander (good decision) pushes case wall irregularity to the outside of the neck and makes the interior case wall uniform and slightly larger in diameter. Beware, expander balls can get tweaked and pull the neck out of plumb with the case body. Many reloaders will use a separate expander die to uniform and align the interior dimension of the neck. Personally I think the bushing die is more appropriate for cases neck turned to a specific wall thickness. (just my .02) You solved your own problem. Keep lots of dated notes to refer back to and many of these mysteries will become self evident. Itty bitty groups to ya'