RCBS 6.5 Creedmoor Die Set for Match Reloading

You want consistent group sizes at 600 yards and reliable headspace in a tight chamber, but standard carbide sets leave too much room for case distortion. This page explains exactly how the RCBS Matchmaster bushing system controls that distortion and sets up for match work.

What the RCBS Matchmaster System Changes for Match Shooters

Standard carbide full-length resizing dies work by pressing a tapered expander plug through the neck to size it. While cheap and effective for hunting or plinking, this method drags the brass, creating friction points that can cause necks to stretch unevenly. For match reloading, where you are chasing 1-2 MOA groups, that uneven stretch destroys consistency. The other half of this decision is exploring the roots of rcbs.

The RCBS Matchmaster system solves this by using separate, interchangeable steel bushings. These bushings fit inside the die body and splay the neck open. Because steel-on-steel contact is minimal compared to a carbide plug, the brass doesn’t get dragged. This preserves the shoulder and ensures the neck diameter stays stable round after round.

When you use this set, you are not just sizing the case; you are building a foundation for concentric bullet alignment. If the neck is stretched unevenly, the bullet will be pushed off-center in the chamber. By using the Matchmaster bushings, you minimize that stretch, leading to tighter node-to-node group sizes at the range.

This approach is not just about precision; it is also about chamber fit. Many match shooters use hand-lapped or chambered barrels with tight tolerances. The Matchmaster allows you to size the case to minimum SAAMI dimensions without the bulky expansion of a standard carbide die, which can make chambering difficult in these tight spaces.

If you are a high-volume reloader for casual use, a carbide set is fine. But if you are a competitor or a long-range hunter who values repeatability over speed, the bushing system is the critical upgrade.

How the Sizing and Seating Process Works

Setting up the Matchmaster dies requires a specific workflow to get the most out of the hardware. First, you must select the correct bushing size. This is determined by measuring your sized case necks with a caliper or micrometer.

You want the neck to be sized so it chambers easily but still allows the bullet to center itself. For the detail, see our notes on our notes on reviewed for precision.

Here is how the process flows on the press:

1. Inspect and Clean: Remove old primer and any carbon from the chamber. Ensure the case mouth is clean.
2. Full-Length Sizing: Run the case through the FL die body with the chosen bushing installed. This sets the shoulder and overall length to spec.
3. Bullet Seating: Move to the seating stem. The Matchmaster uses a micrometer stem that allows for 1/1000th-inch adjustments. This is critical for setting the bullet to your desired seating depth without crimping, unless you are using a roll crimp for semi-autos.

The key difference here is the micrometer seating stem. With a standard die, you guess your seating depth. With the Matchmaster, you dial it in. This ensures that every round has the exact same bearing length, which is a major factor in velocity consistency.

Note that the shell holder is included, but you will need a stable press. The Matchmaster bodies are heavy, so using a quality press with a large diameter spindle ensures the dies don’t wobble during the sizing stroke.

Choosing the Right Bushing Size for Your Chamber

One of the biggest mistakes new match shooters make is picking a bushing size based on the box, not the case. Brass from different manufacturers (Lapua, Hornady, Remington) has different dimensional tolerances. Even within the same brand, lots vary.

You need to measure your sized but not flared case necks. Place a caliper on the neck diameter. Then, compare that to the internal diameter of the bushing. The goal is to have the bushing splay the neck just enough to clear the chamber, without stretching it to the max limit.

If you use a bushing that is too large, you are stretching the neck, which reintroduces the friction issues you are trying to avoid. If it is too small, the case will not fully open, and the bullet will be forced into a tight fit, causing excessive pressure and potential case splitting later.

Start with the smallest bushing that allows the bullet to drop to the desired depth easily. Many shooters will cycle through the provided bushings (usually 3 or 4 sizes) to find their sweet spot. This trial-and-error phase is normal and part of the precision process. If that sounds like your bench, read up on thread size for rcbs dies next.

Common Myths About Precision Die Sets

There is a lot of noise in the reloading community about what “match grade” actually means. Let’s clear up a few misconceptions regarding the RCBS Matchmaster and similar tools.

Myth: The die makes the ammunition accurate.

Fact: The die ensures consistency. Accuracy comes from the bullet, powder, and your rifle’s bore. A great die in a poor rifle won’t shoot well. However, a great die in a good rifle will reveal the true potential of your bullet and powder combination by eliminating variable case dimensions.

Myth: You need a different die for every lot of brass.

Fact: While brass lots vary, a well-chosen bushing size usually covers 90% of commercial brass. You might need to switch bushings if you move from a very thick-necked lot to a thin one, but the die body remains the same. This is cheaper and more efficient than buying new carbide sets for every brand of brass.

Myth: Carbide dies are “weaker” or “less precise.”

Fact: Carbide is a material, not a standard of precision. A carbide die can be just as precise as a steel one if manufactured well. However, the system of the Matchmaster (bushing vs. expander) is what offers the control advantage for match shooters, not just the metal.

Integrating the Die Set into Your Workflow

Buying the dies is step one. Integrating them into a consistent workflow is where the match quality is born. You need a way to verify that the dies are actually doing their job.

Start by creating a master batch. Size 100 cases using your chosen bushing. Measure a sample of these cases for overall length and headspace. Record these numbers. Now, load 20 rounds of your known-good match load. Fire them at the range. Measure the groups. Then, strip the cases and measure the neck stretch on those fired cases.

If the stretch is consistent and small, your workflow is solid. If you see large variations, go back to the die. Did the bushing size change? Did the case get dirty? Did the press get loose?

For the best results, use a caliber gauge to check headspace on every fifth case. This prevents oversizing the shoulder, which is the silent killer of case life. If the gauge shows the headspace is at max, you know it is time to neck-turn or replace that batch of brass.

The bottom line

Frequently asked questions