Wilson Expanding Mandrel Die

(8 customer reviews)



The NEW Wilson Expanding Mandrel Sizing Die. This die is designed to be used on NEW brass cases to prepare the case for the seating opeation.  Over the past few years we have seen a greater need to run new brass cases over and expanding mandrel to properly prepare them for their first firing.  New brass cases are often damaged when shipped in bulk, this die will give you a consistent neck diameter on your cases.  With correct neck tension you can expect a more consistent seating depth and shot!

Includes one mandrel

Additional mandrels sold separately HERE

    • Cut out in die provides an easy view for making sure case aligns and setting up depth
    • Interchangeable Mandrels depending on caliber
    • Standard 7/8ths Reloading Press
    • Die ONLY expands neck to slightly under bullet diameter 
    • Stainless Parts 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 information

Weight N/A
Dimensions N/A

8 reviews for Wilson Expanding Mandrel Die

  1. Gregory Webster (verified owner)

    Much easier to set up than I anticipated, machining work on die is impressive

  2. Mitchell Davis (verified owner)

    Very fast response and awesome customer service

  3. Jeff Mitchel (verified owner)

    I was looking for expander mandrel setup (dies and mandrel) for setting neck tension, and these are 1. perfect and 2. in stock. Machining is perfect as you’d expect from Wilson and KAS actually had them in stock and got them to me in a timely manner.

  4. Frederick Nordi (verified owner)

    Excellent workmanship

  5. mark witter (verified owner)

    very well made should last a long time of reloading

  6. Adam (verified owner)

    Expander mandrel arrived quickly. Couldn’t be more pleased.

  7. Bart (verified owner)

    First, the shipping was super quick! Same day I ordered it was out! Thank you guys! 2nd these Wilson expanding mandrel dies are hard to find and KAS had every caliber I needed in stock. 3rd the dies work flawlessly! Very easy to set up on my Forster Co-ax press. Very smooth operation and makes new Brass so much easier to load. Definitely 5 stars all the way around!

  8. Matthew B. (verified owner)

    I’ve only sized 50 cases with this so far but it seems to be a nice tool to have added to my process. I ordered the 30 cal mandrel. When it came in, the box was labeled 30cal but there was a 22cal mandrel in the die body. (Not Kansas arms fault). I contacted Kansas arms about it and they corrected the issue right away and overnighted me the correct mandrel. Great customer service!! Will be ordering again in the future.

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