RCBS Small Base 6mm ARC SB T/C Die Set - Model 28007

The RCBS Small Base 6mm ARC SB T/C Die Set (Model 28007) is purpose-built for reloaders working with AR-platform rifles chambered in 6mm ARC. This two-die set combines a small base sizer die with a taper crimp seater die—the exact tooling you need to produce ammunition that chambers reliably in semi-automatic rifles. If you're pushing handloads through an AR, small base dies are a smart investment because they size cases more aggressively than standard dies, accounting for the tighter tolerances of autoloading firearms and helping ensure consistent rechamber.

6mm ARC is gaining ground among AR shooters who want effective mid-range ballistics in a truly compact platform. Whether you're reloading for precision work, hunting, or range sessions, consistent ammunition starts with the right dies. RCBS is a trusted name in reloading equipment, and this matched pair is engineered to work together for repeatable case prep and consistent bullet seating.

This is a two-die set, so you'll have the core dies needed for the loading sequence; depending on your setup and workflow, you may need additional equipment like a press, shell holder, and priming tools. Read the product manual and your reloading manual before you begin.

Key Features

• Small Base Sizer Die—sized specifically for AR-platform firearms to ensure proper rechamber
• Taper Crimp Seater Die—delivers consistent bullet seating and crimp
• Matched pair designed to work together for seamless reloading
• RCBS quality engineering and build

Specifications

Frequently Asked Questions

Why do I need a small base die for AR reloading?

Small base dies size brass more aggressively than standard dies, which helps ensure ammunition rechambers reliably in semi-automatic rifles. AR-platform firearms have slightly tighter tolerances than bolt actions, so small base dies reduce the risk of chambering issues and improve consistency across your ammo.

What else do I need to reload with this die set?

This set includes the sizer and seater dies, but you'll also need a reloading press, the appropriate shell holder for 6mm ARC, primers, powder, and bullets. A reloading manual specific to 6mm ARC is essential for safe load development.

Is this die set compatible with my RCBS press?

RCBS dies are designed to work with standard reloading presses that accept standard die threads. Verify your press accepts standard dies and that you have or can obtain the correct shell holder for 6mm ARC before purchasing.

Does this set include a crimp die?

Yes—the taper crimp seater die in this set handles both bullet seating and crimping in one step, which is common for rifle reloading with AR-platform ammo.