L.E. Wilson Expanding Mandrel Sizing Die .337" - EXP-33MD

This L.E. Wilson expanding mandrel die prepares brass cases for optimal bullet seating by expanding the case neck to slightly under bullet diameter, achieving uniform neck tension and consistent seating depth. The die features stainless-steel construction for durability and accommodates interchangeable mandrels (sold separately) for various calibers. Designed for precision reloaders seeking reliable case neck preparation.