When I neck size my 25-06 AI with a Redding Type S Busing Die I get a donut around the exterior of the neck – every time. The “dreaded donut” most think about is formed on the inside of the case neck at the shoulder neck junction as the brass flows forward during firing. My donut is formed on the exterior near the shoulder and caused by my Redding Type S Busing Die.

I was told by Redding (Chris Fox) that what I was seeing was an unsized portion of the neck. Redding’s solution is to use a Series Neck or Full Length die.

Is what they are saying is that I should use a neck or full length die and then from then on I could use my Body Die & Type S Bushing die or until the donut appears again?