RCBS MatchMaster Duo: The Perfect Reloading Die Combo?

Published on May 19, 2026
Duration: 6:22

This guide details the setup and use of the RCBS MatchMaster Duo die set, featuring a full-length sizer and a micrometer seating die. It covers precise shoulder bumping for optimal case fit and magazine compatibility, along with detailed instructions for setting bullet seating depth using the micrometer for consistent results. The process emphasizes achieving desired headspace and overall cartridge length for reliable firearm function.

Quick Summary

The RCBS MatchMaster Duo die set combines a high-quality full-length sizer with a premium micrometer seating die for precision reloading. The sizer offers reduced friction and improved case finish, while the micrometer allows for exact bullet seating depth adjustments, crucial for consistent overall cartridge length and magazine fit.

Chapters

  1. 00:00Introduction to RCBS MatchMaster Duo
  2. 00:11Gavin Gere from Ultimate Reloader
  3. 00:27Available Cartridges
  4. 01:01Full Length Sizer Die Details
  5. 01:48Match Master Seating Die Features
  6. 02:28Setting Up the Sizer Die
  7. 03:05Setting Up the Seating Die
  8. 04:25Magazine Fit Considerations
  9. 04:53Ease of Adjustments
  10. 05:10Conclusion and Call to Action

Frequently Asked Questions

What are the key features of the RCBS MatchMaster Duo die set?

The RCBS MatchMaster Duo die set includes a high-quality full-length sizer with precise geometry and an ultra-finished interior for reduced friction. It also features a premium micrometer seating die for accurate bullet depth control, with a unique window for top-loading bullets.

How do you properly set up the full-length sizer die for rifle cartridges?

To set up the sizer, screw it into the press, raise the ram, and lower the die until it contacts the shell holder with a slight cam-over. Then, size a fired case and measure the base-to-datum dimension to achieve the desired shoulder bump (e.g., 1.5 thousandths for bolt-action).

What is the advantage of the micrometer seating die in the MatchMaster Duo set?

The micrometer seating die allows for extremely precise, incremental adjustments to bullet seating depth. This is crucial for handloaders aiming for consistent overall cartridge length (COL) and optimal performance, especially when working with match-grade bullets.

How does the RCBS MatchMaster Duo die set help with brass longevity?

By allowing precise control over shoulder bump, the sizer die helps reloaders avoid over-sizing brass. Minimizing the amount the shoulder is bumped back reduces stress on the case during resizing, leading to more reloads per case and increased brass longevity.

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