What dies are compatible with the Redding 73310 .310 steel bushing?

The Redding 73310 bushing is directly compatible with all Redding Type S Bushing Full Length and Neck Sizing Dies, as well as Redding Competition Bushing Neck Sizing Dies. It also fits any standard reloading die designed to accept 1/2-inch outer diameter bushings, such as L.E. Wilson bushing dies.

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

Yes, manufacturer guidelines explicitly require case necks to be lightly lubricated when using heat-treated steel bushings like the Model 73310 to prevent brass galling and ensure smooth operation. If you prefer a dry-neck sizing process, Redding recommends upgrading to their Titanium Nitride (TiN) series instead.

Are there any electrical compliance or SAA/RCM certifications required for this tool in Australia?

No electrical compliance or SAA/RCM certifications are required because the Redding 73310 is a completely unpowered, mechanical reloading component weighing approximately 10 to 15 grams.

How do I calculate the correct sizing diameter using a 0.310 inch bushing?

Your sizing should target an outside neck diameter approximately 0.001 to 0.002 inches smaller than a loaded round, leaving about 0.001 inches for brass spring-back to achieve ideal bullet grip tension. Note that cases with neck-wall variations exceeding 0.002 inches should be neck-turned or use an expander button for consistent tension.

Neck Sizing Bushing - Redding 73310

The Redding .310 Heat-Treated Steel Neck Sizing Bushing (Model 73310) provides precise neck tension control for cartridge handloading without excessively working brass. Measuring with an internal diameter of 0.310 inches (approx. 7.874 mm), it sizes the exterior case neck to exact target dimensions, eliminating the need for standard expander balls that can degrade concentricity. Built from precision heat-treated steel hardened to Rockwell C (Rc) 60–62, the bushing features a hand-polished interior to deliver smooth, consistent sizing cycles. It is designed to float inside compatible dies, self-centering on the case neck to reduce bullet runout and extend overall cartridge brass life.

Key Features

Precise Neck Tension Sizing: Delivers an exact 0.310-inch inner sizing diameter to establish consistent neck tension and bullet grip without over-working the brass.
Self-Centering Floating Design: Floats freely within compatible bushing dies to self-align on the cartridge axis, maximising concentricity and minimising bullet runout.
Hardened Steel Construction: Heat-treated to a hardness of Rockwell C 60–62 with a hand-polished interior surface for high wear resistance.
Broad Die Compatibility: Built to industry-standard dimensions of 1/2-inch (0.500") outer diameter and 3/8-inch (0.375") height, fitting all Redding Type S Bushing Full Length and Neck Sizing Dies, Redding Competition Bushing Dies, and standard 0.500" O.D. bushing dies.

Specifications

Internal Sizing Diameter: 0.310 inches (approx. 7.874 mm)
Outer Diameter: 0.500 inches (1/2")
Overall Height: 0.375 inches (3/8")
Material: Heat-treated steel
Hardness Rating: Rockwell C (Rc) 60–62
Die Compatibility: Redding Type S Neck & Full Length Dies, Redding Competition Dies, and standard 0.500" O.D. bushing-style dies
Lubrication Requirement: Case neck lubrication required

Who is the Redding .310 Heat-Treated Steel Neck Sizing Bushing for?

Precision handloaders tuning ammunition concentricity — controls neck dimensions to an exact 0.310-inch internal sizing diameter while floating freely in 0.500-inch die cavities to maintain alignment without pulling an expander ball through the neck.
Benchrest and long-range competition shooters — sizes cartridge brass across repetitive match preparation cycles using a steel reloading neck sizing bushing hardened to Rockwell C 60–62 to prevent dimensional wear.
Reloaders preparing custom hunting cartridges — establishes precise bullet tension for calibres requiring an exact 0.310-inch neck diameter while working within standard 0.375-inch height bushing die pockets to avoid overworking brass necks.

Less suitable for: Cases with neck-wall thickness variations exceeding 0.002 inches without prior neck-turning, or high-volume reloaders sizing cases without neck lubrication; these situations require a standard die equipped with an expander ball or a friction-reducing Titanium Nitride (TiN) coated sizing bushing.

SKU	RD41775LP
Model #	73310
Brand	Redding
Shipping Weight	1.0000kg

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Redding 73310 Steel Neck Sizing Bushing 0.310 Inch

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