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 consistent neck tension. We have found this is the easiest method to greatly reduce your Extreme Spread (ES) and Standard Deviation (SD) numbers.

The complete set includes:
224Cal
• 0.223
• 0.222

243 Cal (6mm)
• 0.242
• 0.241

264 Cal (6.5mm)
• 0.263
• 0.262

284 Cal (7mm)
• 0.283
• 0.282

30 Cal (308)
• 0.307
• 0.306

338 Cal
• 0.337
• 0.336

This product is custom made on order. Kindly allow a lead time of 2 – 4 weeks.