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LE Wilson Expanding Mandrel Die


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The LE Wilson Expanding Mandrel Sizing Die is designed to be used on new rifle cartridge brass cases to prepare them for the seating operation. Over recent years we have seen an increase in demand for running new brass cases over an expander mandrel to properly prepare them for their first firing. New cartridge cases are often damaged when shipped loose or in bulk. This die will remove dings or dents in the case mouth and provide a consistent neck diameter on your cases.  With the correct neck tension you can expect a more consistent seating depth and shot.


  • Cut out in the die body provides an easy view for cartridge case alignment setting up depth
  • Uses Interchangeable Mandrels based on calibre
  • Standard 7/8-14 threading to fit most Reloading Presses
  • Die only expands neck to slightly under bullet diameter 
  • Stainless Steel for a Long Lasting Finish
  • Durable and Accurate
  • L.E. Wilson manufactured lock nut - thickness is .225" from inside to outermost edge .270" for height and 1.250" total width OD

Additional Expanding Mandrels can be found here