Expander Mandrels

From $50.00

Expander Mandrels are ONLY compatible with Short Action Customs Modular Sizing Dies.

NOTE: If you are not currently using a SAC Expander Mandrel in your Modular Sizing die, you will need to purchase a compatible ER11 Collet.  Please see chart in below

Expander Mandrel Size:
NOTE: If you haven't purchased a compatible collet for your mandrel please see compatibility chart below
Categories: , Product ID: 24491


Expander Mandrels

Precision Ground, Solid Carbide, Available in .0005” Increments

Our solid carbide expander mandrels are made to be used in any of our Modular sizing dies with the appropriate collet.

Our Expander Mandrel is unique because it expands the necks of your brass on the “down stroke” instead of the “up stroke” of your press. Furthermore, the precision ground expanding detail is high up in the die, slightly below the cartridge’s neck/shoulder detail. The benefit is that as the cartridge is pulled out of the die, the cartridge neck transitions from the neck bushing to the expander mandrel right away. This 1). ensures a seamless transfer of the cartridge neck from the Neck Sizing Bushing to the Expander Mandrel. 2). Expanding is more consistent because the brass starts off perfectly centered in the die and is immediately expanded as the brass is drawn out of the die body. This is ideal, where expanding on the “up stroke” puts all the stress and pressure on an unsupported case/neck causing runout.

ER11 Collet Compatibility

  • 22 Cal Expander

Requires 6mm Collet

  • 6mm Expander

Requires 1/4″ Collet

  • 6.5mm Expander

Requires 7mm Collet

  • 7mm and .30 Cal Expander

Requires 5/16″ Collet

Additional information

Weight 2 oz
Dimensions 4 × 3 × 1 in


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