PMA Tool

338cal. Expanding Mandrel (.337")

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Our Neck Expanding Mandrels are designed to fit both the 21st Century Shooting and Sinclair Expander Dies. Our mandrels are longer than other expanding mandrels and feature a special dual taper which expands both on the up and down stroke of the press to more uniformly expand and straighten case necks.


Expanding Mandrels are available in the following calibers:

17, 20, 22, 6mm, 25, 6.5mm, 270, 7mm, 30 and 338


Also available in our Neck-Up mandrels for 22cal – 6mm and 6mm – 30cal. Perfect for necking 220 Russian up to 6mm for PPC and 6BR up to 30 caliber for 30BR.







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1 Review

  • 5

    .338 expanding mandrel

    Posted by Carson Byram on 31st Jan 2023

    Another great PMA tool. I’ll use this in my long expander die body to expand the necks of 30-06 brass to make .338-06 brass.

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