Which specific calibres are compatible with the RCBS Expander Decapping Unit .320?

This unit is specifically designed for bottleneck rifle cartridges requiring a nominal .320 inch expander diameter, primarily the .32 Winchester Special and .32-40 Winchester. It is not compatible with straight-wall handgun cartridges or 8mm Mauser cartridges that require a .323 inch unit.

Will this decapping unit work with Berdan-primed brass or small flash holes?

No, the assembly uses standard RCBS headed decapping pins designed strictly for Boxer-primed brass with standard flash hole sizes. It is not compatible with Berdan-primed cases or small undersized .057 inch benchrest flash holes.

What sizing dies can this unit be installed into?

The RCBS Expander Decapping Unit .320 is engineered to fit standard RCBS 7/8 inch-14 threaded sizing dies that feature internal decap rod threading. It serves as a direct drop-in replacement part for maintaining precise case concentricity during reloading.

Decapping Unit - RCBS R9816

The RCBS Expander Decapping Unit .320 (part number 9816) is a precision-machined, hardened steel internal die assembly designed for full-length reloading dies. It performs two core operations simultaneously during the case sizing stroke: removing spent Boxer primers from the flash hole and expanding the cartridge case neck to an internal diameter of .320 inches (.320"). Engineered as a direct drop-in factory replacement, this mechanical assembly threads directly into standard reloading dies to restore proper case alignment, minimise neck runout, and eliminate reloading downtime caused by bent decapping rods or worn expander balls.

Key Features

Dual-Action Case Prep: Simultaneously punches out spent primers and sizes case necks to an exact .320" diameter on the press stroke.
Precision Alignment: Hardened steel construction maintains concentricity with the die body to prevent case neck runout.
Direct Replacement Assembly: Complete factory assembly including the threaded rod, .320" expander ball, headed decapping pin, and retaining hardware.
Standard Thread Interface: Integrates directly into standard 7/8"-14 threaded RCBS bottleneck sizing dies.

Specifications

Expander Size: .320 inches (.320")
Compatible Die Interface: Standard RCBS 7/8"-14 threaded sizing die bodies
Primer/Flash Hole Compatibility: Standard Boxer-primed cases using standard headed decap pins
Total Packaged Weight: Approximately 50 g to 80 g
Primary Cartridge Compatibility: .32 Winchester Special (.32 Win Spl) and .32-40 Winchester

Who is the RCBS Expander Decapping Unit .320 for?

.32 Winchester Special Handloaders — requires a dedicated .320" expander diameter within 7/8"-14 threaded bottleneck sizing dies to decap and properly set neck tension on classic .32 Win Spl lever-action rifle brass using this RCBS expander decapping unit.
.32-40 Winchester Target Shooters and Reloaders — needs a precise .320" expander size to maintain proper bullet seating tension and case concentricity when sizing vintage bottleneck rifle cases with this reloading expander decapping unit.

Less suitable for: Straight-wall .32-calibre handgun cartridges requiring a dedicated short decapping unit or separate neck expanding die, .323" bore/8mm Mauser cartridges requiring a larger .323" expander unit, or cases with small .057" benchrest or Berdan flash holes that require specialised undersized decapping pins.

SKU	RC39528LP
Model #	R9816
Brand	Rcbs
Shipping Weight	1.0000kg

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Rcbs R9816 Expander Decapping Unit .320 Hardened Steel

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