Redding Competition Neck Sizing Die .300 Winchester Magnum

• Neck-only sizing for chamber-matched brass: This die sizes the neck while leaving the case body fire-formed to the rifle chamber, which helps preserve case fit, reduce working of the brass, and support consistent cartridge alignment.
• Type S bushing system: The interchangeable bushing design lets the handloader tune neck tension to the brass and bullet combination, an important advantage when building precise .300 Winchester Magnum loads.
• Micrometer-style adjustment: Fine adjustment makes setup more repeatable and easier to return to a known setting, which is useful when loading for a proven rifle and bullet recipe.
• Steel die construction: The steel body is built for long service life and stable sizing performance over many loading cycles, especially for high-pressure magnum rifle cases.
• Standard 7/8"-14 press fit: Compatibility with common reloading presses makes it easy to integrate this die into an established bench setup without special adapters.

About the Competition Series

Redding Competition series dies are built for handloaders who place a premium on repeatable cartridge geometry and careful control over each stage of the loading process. Within the Redding lineup, the Competition family sits above basic hunting dies and focuses on the needs of precision rifle shooters, load developers, and experienced reloaders who want tighter control over neck tension, bullet alignment, and seating consistency.

For bottleneck rifle cartridges, the series is known for combining bushing-style neck sizing with refined adjustment systems that make small changes easier to manage. Rather than forcing every case through a one-size-fits-all neck dimension, these dies are designed around interchangeable bushings so the user can match sizing more closely to brass thickness and the intended bullet grip. That approach is especially useful for shooters working with carefully prepared brass and rifles that reward uniform ammunition. Across the series, the design philosophy emphasizes mechanical precision, durable steel construction, and compatibility with standard loading equipment, making Competition dies a common choice for reloaders who want bench-level control without moving away from conventional single-stage press workflows.

About the Redding Competition Neck Sizing Die .300 Winchester Magnum

The Redding Competition Neck Sizing Die .300 Winchester Magnum is built for reloaders who want to keep their brass closely matched to a specific chamber while still controlling neck tension with more precision than a conventional neck die allows. By sizing only the case neck, it avoids unnecessary working of the case body and shoulder. In practical use, that can help extend brass life and maintain the close chamber fit that many precision shooters prefer when loading for one rifle.

The die uses Redding’s Type S bushing neck die system, which means neck sizing is controlled by a removable bushing rather than a fixed internal dimension. That gives the handloader a more deliberate way to manage bullet hold, especially when brass wall thickness, bullet choice, or load purpose calls for a specific amount of neck tension. On a cartridge such as .300 Winchester Magnum, where consistency matters for long-range hunting or precision target work, that flexibility is one of the die’s main strengths.

Micrometer adjustment adds another practical benefit by making setup changes easier to track and repeat. Combined with the steel die body and standard 7/8"-14 thread, the result is a die that fits easily into common press setups while offering a more exact, methodical approach to neck sizing. It is best suited to reloaders who separate brass by rifle and want a controlled, repeatable path to concentric ammunition.

About Redding

Redding Reloading Equipment was founded by Burr Bement in 1946 in Virgil, New York. The company built its reputation around tools for handloading ammunition and later expanded its product range to include presses, powder measures, scales, case-preparation tools, and a broad selection of rifle and pistol dies. Redding was incorporated as Redding-Hunter, Inc. in 1956 and began marketing its products under the Redding Reloading Equipment name in the 1960s.

Within the reloading field, Redding is particularly well known for Type S bushing dies and its Competition series dies, both of which are closely associated with precision rifle loading. The company remains based in Cortland, New York, United States, and its product development continues to focus on giving experienced handloaders more control over sizing, seating, and case preparation.

Main Features

• Manufacturer: Redding
• Made in: USA
• Die operation: Neck sizing
• Pack size: Single
• Die type: Bushing, Standard
• Bushing: Yes
• Bushing style: Type S - Bushing Neck Die
• Case body design: Bottle neck
• Case type: Boxer, Rifle
• Sizing die material: Steel
• Material: Steel
• Adjustment: Micrometer
• Press compatibility: Standard 7/8"-14 thread
• Bullet Diameter (mm).: 7.82 mm
• Bullet Diameter (inch).: 308.00 inch
• Compatible calibers: .300 Winchester Magnum, .300 WM

Warranty

2 years. This product carries a 2-year warranty, making the coverage period clear for reloaders who want a defined term rather than an open-ended policy description.