These neck dies are designed so the user can control and/or change the amount of neck sizing the cartridge case receives. The dies use interchangeable sizing bushings that size the outside of the case neck. The conventional expander is eliminated, improving concentricity and prolonging brass life. The die is used with an arbor press. All Wilson neck dies size the neck to 3⁄16" from the mouth end, a practice many shooters prefer. Bushings not included. Dies include a decapping rod.
The Sinclair Neck Die Base (#749-001-608) is used along with the Wilson neck dies. This necessary accessory allows you to rotate your neck die from the sizing position to the decapping position (rotate 180°). Spent primers conveniently collect underneath the base. Manufactured from stainless steel.
Sinclair, Issue:4A, Page:050