RCBS 9812 Expander/Decapping Unit .30 Cal

RCBS Expander/Decapping Assembly for .30 Caliber

This precision reloading component is an essential tool for anyone preparing bottleneck cartridges for the reloading press. The assembly works in conjunction with your sizing dies to accomplish two critical tasks in a single operation: removing spent primers and expanding the case neck to proper dimensions.

Key Features

• Ultra-hard carbide expander button resists wear and maintains consistent neck expansion over thousands of rounds
• Adjustable positioning sleeve allows you to fine-tune expander placement for optimal case preparation
• Integral decapping pin removes spent primers safely and reliably
• Designed for .30 caliber bottleneck cartridges including .30-06 Springfield, .308 Winchester, and similar cases

How It Works

The expander/decapping assembly mounts directly into your RCBS sizing die. As the die closes on the case, the decapping pin pushes out the spent primer while the carbide expander button simultaneously opens the case neck to the proper inside diameter. This dual-action approach saves time and ensures consistent case preparation.

Why It Matters

Precise case preparation is the foundation of accurate handloads. Proper neck expansion prevents case splitting and ensures bullets seat with consistent tension. The carbide construction of this assembly means it will maintain its dimensions shot after shot, year after year.