Body Dies are designed to full length resize the case body, bump the shoulder position for proper chambering, but not size the neck at all. They are made without internal parts and are intended for resizing cases which have become increasingly difficult to chamber after repeated firing. After using a body die, the case should be run through the neck die to achieve proper neck tension. Sold separately or as part of a set.
Big Book Catalog, Issue:67, Page:516
Sinclair, Issue:4B, Page:038