Wilson Expanding Mandrel

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Wilson Expanding Mandrel

*This is the Mandrel only*

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 operation. Over the past few years Wilson has 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!

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