Rcbs Matchmaster Competition Neck Bushing Set .300 Norma Mag
$177.34
The RCBS Matchmaster Competition Neck Bushing Set for .300 Norma Mag gives precision reloaders a modular solution for controlling neck tension and optimizing case life. Built from case-hardened steel with precision-drilled and hand-polished internal surfaces, this neck-sizing die set delivers the consistency that long-range and benchrest shooters demand. The interchangeable neck bushing system—proven over decades in competitive reloading—lets you dial in exact bullet runout and brass tension without the guesswork, keeping your .300 Norma Mag cases working harder and longer.
This set includes both the neck-sizing die and a bullet-seating die engineered for concentricity. The seating die features RCBS's loading window with an internal sleeve that catches and centers the bullet, so you can simply drop it in and press—no balancing on the case mouth or risking your fingers. The large micrometer adjustment knob is oversized and clearly marked, letting you dial precise changes down to one thousandth of an inch and read them easily from any angle. A titanium carbo-nitride expander in the sizing die reduces brass buildup and makes extraction smooth.
All dies feature standard 7/8"-14 threading and are made in the USA. Note that neck bushings are sold separately, so you'll need to select the right diameter for your .300 Norma Mag brass and desired neck tension. This is a serious tool for reloaders who measure case runout, chase accuracy, and want their brass to last through many reloading cycles.
Key Features
- Neck-sizing die and bullet-seating die in one set for .300 Norma Mag
- Interchangeable neck bushing system for precise neck tension control
- Loading window with bullet retention system for safe, aligned seating
- Titanium carbo-nitride expander reduces brass buildup
- Large micrometer adjustment knob with oversized markings
- Free-floating, self-centering bullet-seating stem for concentricity
- Case-hardened steel construction with hand-polished internal surfaces
- Standard 7/8"-14 thread compatibility
- Made in USA
Specifications
| Cartridge | .300 Norma Mag |
| Die Set Type | Neck Sizing and Bullet Seating |
| Material | Case-hardened steel |
| Expander | Titanium carbo-nitride |
| Thread | 7/8"-14 |
| Adjustment | Micrometer (0.001" increments) |
| Origin | Made in USA |
Frequently Asked Questions
Do neck bushings come with this set?
No—neck bushings are sold separately. You'll need to select the correct bushing diameter for your .300 Norma Mag brass and your desired neck tension. RCBS offers a range of bushing sizes for this purpose.
What's the difference between neck sizing and full-length sizing?
This is a neck-sizing set, which sizes only the neck of the case to manage bullet tension and runout. It reduces overall brass working compared to full-length sizing, extending case life—ideal for precision rifle reloading where consistency and case longevity matter.
Can I use this in any reloading press?
These dies feature standard 7/8"-14 threading, so they'll fit any press equipped with standard die stations. The loading window on the seating die is designed to work with most modern single-stage and turret presses.
What does the titanium carbo-nitride expander do?
The expander reduces brass buildup on the expander ball itself and makes case extraction smoother, contributing to easier cycling and longer case life.
