
Availability: In Stock
The Redding 300 Weatherby Magnum Competition Bushing Neck Die Set is a precision reloading solution for handloaders pursuing match-grade accuracy with one of magnum rifle shooting's most demanding cartridges. This three-piece set—neck sizing die, body die, and bullet seater—is built around Redding's competition-grade bushing system, which isolates neck sizing from shoulder work and lets you dial in neck tension with micrometer precision. If you're chasing tight groups on the range or hunting at extended distances with a 300 Weatherby Magnum, this die set gives you the control to produce consistently dimensioned ammunition.
The Competition Bushing Neck Die is the heart of the system. Your case is fully supported and aligned before sizing begins, then held snugly in a sliding sleeve as it moves upward to meet the resizing bushing. The bushing self-centers on the neck, and the decapping rod stays in precise alignment—just like a firing pin in the chamber. The micrometer adjustment lets you fine-tune exactly how much neck length gets sized, which is critical when you're working with premium brass and seeking repeatable neck tension.
The Body Die handles full-length resizing of the case body and adjusts shoulder position for reliable chambering, without touching the neck you've just sized. That separation of concerns is what competition reloaders value: you size the neck to your spec, and the body die does its job independently.
The Competition Bullet Seater uses a floating seating stem with unusually tight manufacturing tolerances. That precision fit means the stem can literally float as it aligns the bullet, reducing runout and variation from round to round. Note that bushings and shellholder are sold separately, so check your caliber requirements before ordering.
| Caliber | 300 Weatherby Magnum |
| Set Contents | Competition Bushing Neck Die, Body Die, Competition Bullet Seater |
| Neck Die Adjustment | Micrometer |
| Bullet Seater Adjustment | Micrometer |
| Bushings | Sold separately |
| Shellholder | Sold separately |
Yes. The die set includes the neck sizing die, body die, and seater, but bushings and shellholder are not included and must be ordered separately to complete your setup.
This is a bushing-style neck die set, which means you size only the neck and leave the shoulder alone—that's different from full-length sizing dies. The micrometer adjustment on both the neck die and seater gives you precise control over neck length and bullet seating depth, critical for consistency in a magnum round. The floating seating stem further reduces runout, which matters when you're handloading for accuracy.
The set is marketed as a competition product and is built to competition-grade tolerances, so it's ideal for precision handloaders pursuing tight groups, whether on the range or in the field. The bushing system and micrometer adjustments are overkill for casual plinking but exactly right if you're serious about ammunition quality.
The set contains a Competition Bushing Neck Sizing Die with micrometer adjustment, a Body Die for full-length resizing and shoulder bumping, and a Competition Bullet Seater with micrometer adjustment and floating seating stem. Bushings and shellholder are ordered separately.

SKU: 167528855 • Weight: 2oz





Availability: In Stock
The Redding 300 Weatherby Magnum Competition Bushing Neck Die Set is a precision reloading solution for handloaders pursuing match-grade accuracy with one of magnum rifle shooting's most demanding cartridges. This three-piece set—neck sizing die, body die, and bullet seater—is built around Redding's competition-grade bushing system, which isolates neck sizing from shoulder work and lets you dial in neck tension with micrometer precision. If you're chasing tight groups on the range or hunting at extended distances with a 300 Weatherby Magnum, this die set gives you the control to produce consistently dimensioned ammunition.
The Competition Bushing Neck Die is the heart of the system. Your case is fully supported and aligned before sizing begins, then held snugly in a sliding sleeve as it moves upward to meet the resizing bushing. The bushing self-centers on the neck, and the decapping rod stays in precise alignment—just like a firing pin in the chamber. The micrometer adjustment lets you fine-tune exactly how much neck length gets sized, which is critical when you're working with premium brass and seeking repeatable neck tension.
The Body Die handles full-length resizing of the case body and adjusts shoulder position for reliable chambering, without touching the neck you've just sized. That separation of concerns is what competition reloaders value: you size the neck to your spec, and the body die does its job independently.
The Competition Bullet Seater uses a floating seating stem with unusually tight manufacturing tolerances. That precision fit means the stem can literally float as it aligns the bullet, reducing runout and variation from round to round. Note that bushings and shellholder are sold separately, so check your caliber requirements before ordering.
| Caliber | 300 Weatherby Magnum |
| Set Contents | Competition Bushing Neck Die, Body Die, Competition Bullet Seater |
| Neck Die Adjustment | Micrometer |
| Bullet Seater Adjustment | Micrometer |
| Bushings | Sold separately |
| Shellholder | Sold separately |
Yes. The die set includes the neck sizing die, body die, and seater, but bushings and shellholder are not included and must be ordered separately to complete your setup.
This is a bushing-style neck die set, which means you size only the neck and leave the shoulder alone—that's different from full-length sizing dies. The micrometer adjustment on both the neck die and seater gives you precise control over neck length and bullet seating depth, critical for consistency in a magnum round. The floating seating stem further reduces runout, which matters when you're handloading for accuracy.
The set is marketed as a competition product and is built to competition-grade tolerances, so it's ideal for precision handloaders pursuing tight groups, whether on the range or in the field. The bushing system and micrometer adjustments are overkill for casual plinking but exactly right if you're serious about ammunition quality.
The set contains a Competition Bushing Neck Sizing Die with micrometer adjustment, a Body Die for full-length resizing and shoulder bumping, and a Competition Bullet Seater with micrometer adjustment and floating seating stem. Bushings and shellholder are ordered separately.
SKU: 167528855 • Weight: 2oz
