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If you shoot the .257 Roberts and you're chasing tighter groups, the seating step is where a lot of accuracy is won or lost. The RCBS Matchmaster Seater Die was built for exactly that part of the process, combining the best ideas from the old Gold Medal and Competition lines into one tool aimed at reloaders who care about repeatability. This is a dedicated bullet seating die, so pair it with a sizing die to round out your setup.
The body is machined, polished, and finished with a deep blued coating that honestly looks more like a fine firearm part than a workbench tool. It threads into any press using the standard 7/8"-14 mount, so it drops right into whatever single-stage or turret press you already run.
The standout here is the bullet seating window with a built-in retention system. Instead of balancing a bullet on the case mouth and hoping it stays put, you drop the bullet into the side window and run the press. An internal sleeve catches and holds it in line with the case, so the bullet goes in straight every time. That means less runout and the kind of concentricity that shows up on paper.
Up top you get a large, oversized micrometer knob with bold letters and clear hash marks. Each graduation moves seating depth 0.001 inch, so when you dial a thousandth, that's exactly what you get. It's easy to read and easy to turn, which makes load development a lot less fiddly when you're testing different depths off the lands. The free-floating, self-centering seating stem keeps the bullet aligned through the whole stroke.
One thing worth knowing: the Matchmaster Seater does not crimp. It's a pure seating die, which is how most precision reloaders prefer to work anyway. Made in the USA and backed by the RCBS Limited Lifetime Warranty, it's the kind of tool you buy once and keep on the bench for years.
No, this is a dedicated bullet seating die only. You'll need to pair it with a full-length or neck sizing die to have a complete reloading setup for .257 Roberts. Many precision reloaders prefer buying the seater on its own so they can match it with the sizing style they like best.
The oversized micrometer knob adjusts seating depth in 0.001 inch increments. Each hash mark moves the bullet exactly one thousandth of an inch, and the bold markings make it easy to read and repeat. That level of control is a big help during load development when you're testing seating depth off the lands.
No, the Matchmaster Seater Die has no crimp provision. It is a pure seating die designed to focus entirely on straight, concentric bullet seating. If you need a crimp, you'd add a separate crimp die to your process.
Yes, it uses the standard 7/8"-14 thread, so it works in virtually any single-stage or turret press that accepts standard dies. That includes RCBS presses as well as most other common brands on the market.
| UPC | 850070830492 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 12540 |
| Shipping Weight | 0.915 |
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