What dies are compatible with the Redding 73339 steel neck sizing bushing?

This bushing fits all Redding Bushing-Style Sizing Dies, including Type S Bushing Full Length Dies, Type S Neck Sizing Dies, and Competition Bushing Neck Sizing Dies. It also features standard dimensions that make it cross-compatible and interchangeable with L.E. Wilson style bushing dies.

Do I need to lubricate my cartridge case necks when using this heat-treated steel bushing?

Yes, external case neck lubrication is strictly recommended by Redding for this standard heat-treated steel model to prevent brass galling or sticking. If you prefer to size your brass without any neck lubrication, you should look into upgrading to Redding Titanium Nitride Coated Bushings instead.

What is the maximum reduction step I can make in a single pass using the 0.339 bushing?

Redding recommends sizing brass necks down in steps of no more than 0.004 to 0.005 inches at a time. If your specific cartridge case requires reducing the neck diameter by more than 0.005 inches, you must use a stepped progression with multiple bushings to avoid buckling or excessive brass deformation.

Does this mechanical reloading accessory require any electrical compliance or SAA/RCM certification for use in Australia?

No electrical compliance or SAA/RCM certifications are required for this product. The Redding 73339 is a completely non-powered, purely mechanical reloading die accessory that relies entirely on hand press operation rather than electrical power.

Neck Sizing Bushing - Redding 73339

The Redding .339 Heat-Treated Steel Neck Sizing Bushing (MPN: 73339) is a precision reloading component manufactured in the USA for precise case neck tension control. Designed to size cartridge case necks externally to a fixed 0.339-inch diameter, it eliminates the need for standard expander balls, which minimizes brass stretching and extends case life. Featuring a standard 0.500-inch outer diameter and a 3/8-inch (0.375-inch) length, this non-powered, mechanical bushing fits all Redding Bushing-Style Sizing Dies (Type S Full Length, Type S Neck, and Competition Neck dies) and is fully cross-compatible with L.E. Wilson style dies.

Key Features

Precise Neck Tension: Sizes the outer case neck to exactly 0.339 inches to provide consistent bullet release and enhance concentricity without overworking brass.
Wear-Resistant Construction: Heat-treated to a hardness of Rockwell C (Rc) 60–62 with a hand-polished inner surface to reduce sizing friction.
Expander-Free Sizing: Eliminates or reduces expander button use, significantly decreasing brass fatigue and lengthening reload cycles.
Standard Die Integration: Features an industry-standard 0.500-inch outer diameter and 0.375-inch length to drop directly into compatible bushing sizing dies.

Product Specifications

Internal Sizing Diameter: 0.339 inches
Outer Diameter: 0.500 inches (1/2 inch)
Overall Length: 0.375 inches (3/8 inch)
Material: High-grade steel, heat-treated to Rc 60–62
Finish: Hand-polished interior sizing bore
Die Compatibility: Redding Type S Neck Sizing Dies, Redding Type S Full Length Dies, Redding Competition Neck Sizing Dies, and L.E. Wilson bushing dies
Power Requirements: None (manual, mechanical reloading component)

Who is the Redding .339 Heat-Treated Steel Neck Sizing Bushing for?

Precision rifle handloaders — achieves exact neck tension for .30-calibre cartridges (such as .308 Winchester or .300 Win Mag depending on wall thickness) by using an exact 0.339-inch internal sizing diameter to avoid overworking brass.
Competitive target shooters — fits standard 0.500-inch outer diameter by 0.375-inch length die cavities to size brass necks with a hardened Rockwell C (Rc) 60–62 surface, maximizing cartridge concentricity without an expander ball.

Less suitable for: Reloaders reducing neck diameter by more than 0.005 inches in a single pass (which requires a stepped progression of multiple intermediate bushings to prevent case buckling), or handloaders who require sizing without case neck lubricant, who should upgrade to a Titanium Nitride (TiN) coated bushing.

SKU	RD41781LP
Model #	73339
Brand	Redding
Shipping Weight	1.0000kg

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Redding 73339 Steel Neck Sizing Bushing 339 Inch Diameter

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