Skip to product information
1 of 4

Simms Arms

Expander Mandrel Set

Expander Mandrel Set

Regular price R 2,215.00 ZAR
Regular price Sale price R 2,215.00 ZAR
Sale Sold out

Expander Mandrel Set

Commercial die manufacturers have no set standards for the Expander ball in their dies. Due to the large variations, this makes it necessary to properly size the inside diameter before seating. 


We recommend removing the expander ball completely from your resizing dies. Your last step before adding powder will be to expand your necks using the appropriate expander mandrel. We recommend using Imperial sizing lube when using the mandrels, a little bit goes a long way. We use a single stage press to seat the primer and expand the neck on the down stroke, then we pack the "ready for powder" brass into our APW reloading trays.

The Die body fits your normal reloading press and the interchangeable mandrels are sized to precise dimensions. The kit includes mandrels for running 0,001 or 0,002 neck tension as well as a base to keep everything in place while not in use.  

 The APW Expander Mandrel will smooth out and slightly expand the case neck so the brass will be ready for consistant neck tention. We have found this is the easiest method to greatly reduce your Extreme Spread (ES) and Standard Deviation (SD) numbers.

 The complete set includes: 



243 Cal (6mm)


264 Cal (6.5mm)


284 Cal (7mm)


30 Cal (308)


338 Cal


PLEASE NOTE: The Lead time is 12-15 working days.

  • Lead Times

    Current lead times on out of stock sets is 12-15 working days.

View full details