Description
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.
11 Reviews
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30cal. Expander Mandrel
Used with the expander die body to straighten up some new Lapua cases that were deformed during shipping. The mandrel worked great to bring the cases back to proper size.
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Best way I know to attain even neck tension
The carbide expander gently moves the neck to roughly 2 thousands under 308 diameter. Unless your necks are exactly even then even neck bushings don't provide even neck tension. Getting SD below 4 feels really good after all the case prep work.