The RCBS Expander Decapping Unit (6.5x47 Lapua / 6.5 Creedmoor) is an internal replacement assembly designed for RCBS Full-Length and Neck Sizing dies. Operating as a dual-function mechanical unit, it simultaneously expels spent primers and expands the case neck during a single press stroke. The assembly includes a threaded steel rod, a calibre-specific .264-inch (6.5mm) expander ball, a replaceable standard decapping pin, and a locking collet nut assembly.

Key Features

• Dual-Action Processing: Punches out spent primers using an interchangeable decapping pin while drawing the .264-inch expander ball through the case neck to establish proper projectile seating tension.
• Hardened Steel Construction: Machined to close tolerances to maintain concentricity and minimise case neck runout during resizing.
• Field-Replaceable Decapping Pin: Uses standard interchangeable RCBS decapping pins that can be replaced directly if damaged by misaligned cases.
• Direct OEM Fit: Designed to fit standard RCBS bottleneck sizing dies threaded for internal expander-decapper assemblies.

Specifications

• Calibre: .264 calibre / 6.5mm
• Cartridge Compatibility: 6.5x47mm Lapua, 6.5 Creedmoor
• Component Type: Internal die expander-decapping rod unit
• Included Components: Threaded steel rod, .264-inch expander ball, replaceable decapping pin, locking collet/hex nut
• Flash Hole Compatibility: Standard flash holes (~0.080 in / 2.0 mm)
• Power Requirements: Manual mechanical operation (0V)

Who is the RCBS Expander Decapping Unit 6.5x47 6.5 Creedmoor for?

• 6.5mm Creedmoor precision rifle handloaders — requires this reloading die expander decapping unit to resize fired cases and set the exact .264-inch internal neck tension needed for standard 6.5mm match projectiles.
• 6.5x47mm Lapua competitive target shooters — relies on the dedicated 6.5mm (.264") expander ball assembly inside standard sizing dies to maintain concentric case neck dimensions across repeat firings.

Less suitable for: Handloaders processing non-standard brass with small 0.057-inch to 0.060-inch (1.5 mm) flash holes or military cases with crimped primer pockets, who require an undersized 0.057-inch decapping pin or a dedicated heavy-duty universal decapping die; it is also incompatible with non-6.5mm calibres (.224, 6mm, .270, 7mm, .30 cal) and proprietary bushing-only sizing dies.