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The RCBS Matchmaster Seater Die for 300 AAC Blackout is the die you reach for when consistency matters. It brings micrometer-adjustable seating to the subsonic and supersonic Blackout crowd, letting you nail your seating depth down to a single thousandth of an inch and return to it load after load. If you've been chasing tighter groups out of your bolt gun or AR, this is the kind of upgrade that shows up on paper.
The standout feature is the bullet loading window paired with a retention system. Instead of balancing a bullet on the case mouth and guiding it up with your fingers, you drop the projectile into the window and run the press. An internal sleeve catches the bullet, holds it in alignment with the case, and guides it straight into the seat for low runout and highly concentric ammo. It's a cleaner, safer way to work through a loading session, and it genuinely helps with repeatability.
RCBS machines these from case-hardened steel, then precision-drills, reams, and hand-polishes the internal surfaces before finishing the body with a deep blued look you'd expect on a nice firearm. The free-floating, self-centering seating stem is adjustable for your case overall length, so whether you're loading heavy subsonic pills or lighter supers, you can tune it to the projectile you're running. The large oversize micrometer knob has big, easy-to-read numbers and hash marks that make dialing precise and quick, even in less-than-perfect bench lighting.
The die uses a standard 7/8-14 thread, so it drops right into single-stage and turret presses without any special adapters. Keep in mind this is a standalone bullet seating die, not a full set, so you'll pair it with your preferred sizing die. Made in the USA in Oroville, California, and backed by RCBS's limited lifetime warranty, it's built to earn a permanent spot on the bench.
This is a standalone bullet seating die only. You'll need to pair it with a sizing die to complete your reloading setup. RCBS offers Matchmaster sizing dies and Duo sets separately if you want to run the full Matchmaster line.
The large oversize micrometer knob lets you set seating depth in precise one-thousandth-of-an-inch increments with big, easy-to-read markings. Once you find the depth your rifle likes, you can return to it exactly every time. That repeatability is what helps shrink group sizes with 300 Blackout handloads.
Yes, it uses the industry-standard 7/8-14 thread, so it threads directly into virtually any single-stage or turret press. No special adapters or modifications are needed to start loading.
You drop the bullet into the window and run the press rather than balancing it on the case mouth by hand. An internal sleeve catches the bullet and keeps it aligned with the case as it seats, which produces straighter, more concentric rounds with lower runout. It also keeps your fingers out of harm's way during the stroke.
| UPC | 850070830553 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 22440 |
| Shipping Weight | 1.0 |
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