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The Redding Competition Seating Die for 300 Remington Ultra Magnum is built for handloaders who care about seating depth and bullet runout down to the last thousandth of an inch. This is the die that earned Redding its reputation as the state of the art in straight-line seaters, and once you run a few cases through it, you understand why. Instead of a simple threaded stem pushing a bullet into an unsupported neck, this design surrounds the whole cartridge and aligns everything before any pressure is applied.
The heart of this die is the precision ground sliding sleeve. It is reamed to chamber dimensions in line with SAAMI specs, so when your 300 RUM case enters, it is captured and centered the same way it would sit in a rifle chamber. A spring system raises the case and bullet up to the seating stem, holding everything in alignment so the case cannot wander mid-stroke. The seating stem itself is ground to match bullet diameter and floats so closely in the sleeve that it rides on a column of trapped air. The payoff is finished ammo with very low bullet runout, which is exactly what you want chasing accuracy out of a cartridge like the Ultra Mag.
The micrometer top reads in .001 inch increments, with .050 inch per full revolution, and the adjustment is click-free and infinitely variable. That makes load testing painless because you can creep your seating depth in tiny steps and come right back to a setting that shot well. There is also a zero-set feature that lets you reference the micrometer to your favorite depth or a specific rifle, so switching between bullets or loads is quick and repeatable.
This is a dedicated seating die, not a full set, so you will still need a sizing die for your brass. It uses standard 7/8-14 press threads and works with a standard shellholder, which is sold separately. If you are loading the 300 RUM for long range or just want tighter groups, this is the seater that gets you there.
No, this is a standalone bullet seating die only. You will still need a sizing die to resize your 300 RUM brass before seating bullets. Many reloaders pair it with a Redding full-length or neck sizing die to build a complete setup.
It uses a standard shellholder, which is sold separately. The die itself threads into any press with industry standard 7/8-14 threads. Just match the shellholder to the 300 Remington Ultra Magnum case head.
The micrometer head is graduated in .001 inch increments with .050 inch of travel per full revolution, and the adjustment is click-free for fine tuning. It also has a zero-set feature so you can reference the micrometer back to a favorite seating depth. That makes dialing in and repeating loads fast and consistent.
The main difference is the precision ground sliding sleeve that captures and centers the entire cartridge before the bullet starts to seat. That alignment, combined with a floating seating stem, produces finished rounds with very low bullet runout. For precision and long range loads, it is a noticeable step up over a basic seating die.
| UPC | 611760552885 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 55288 |
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