Re: Need to order dies and need help.
The expander does in fact, force the brass down as the shellholder comes up, forming a donut in and out near the base of the neck. Removal requires an inside reamer and a outside neck turner. I like the K&M turner, which can be adjusted by .0001 clicks. K&M also makes an inside reamer (as do RCBS, Redding, Forster, etc.) If the base of your bullet does not touch the donut inside, it is of no consequence and does not require removal. If not removed, the exterior donut will reform inside the neck when case is fired. Best to turn it off.