How do I determine if the 0.231-inch sizing diameter is the correct size for my specific .20-calibre brass?

To select the proper bushing, measure the outside neck diameter of a loaded cartridge using a precision micrometer and subtract 0.001 to 0.002 inches to account for brass springback and bullet retention. The 0.231-inch model specifically suits neck setups yielding approximately 0.232 to 0.233 inches on loaded rounds, commonly found in .204 Ruger or .20 Tactical applications.

Which reloading dies are compatible with this Redding 73231 steel neck sizing bushing?

This bushing features standard external dimensions of a 1/2-inch outer diameter and a 3/8-inch length, making it fully compatible with all Redding bushing-style dies, including Type S Neck Sizing Dies, Type S Full-Length Dies, and Competition Bushing Neck Sizing Dies. It is also cross-compatible with standard Wilson-style neck sizing dies.

Do I need to apply case neck lubrication when using this heat-treated steel bushing?

Yes, Redding explicitly recommends applying case neck lubrication when using heat-treated steel bushings to reduce friction, prevent brass scuffing, and ensure smooth operation. For users looking to size without neck lubrication or seeking extended wear life, Redding Titanium Nitride coated bushings serve as an alternative.

Are there any Australian electrical or regulatory compliance certifications required for this tool?

No, as a purely mechanical reloading tool with zero electrical or wireless components, electrical standards such as 240V compatibility, SAA approvals, and RCM tick certifications are entirely non-applicable for this product.

Neck Sizing Bushing - Redding 73231

The Redding .231 Heat-Treated Steel Neck Sizing Bushing (Model 73231) provides precise neck tension control for metallic cartridge reloading. It sizes the outside diameter of cartridge case necks without requiring an expander ball pull-through, eliminating brass overworking, extending case life, and enhancing concentricity. Manufactured from heat-treated alloy steel, the internal sizing surface is hardened to Rockwell Rc 60–62 and hand-polished to minimise sizing effort and reduce friction. It fits all Redding Type S Neck Sizing Dies, Type S Full-Length Dies, Competition Bushing Neck Sizing Dies, and standard Wilson-style neck sizing dies.

Key Features

Precise Neck Sizing: Delivers an internal sizing diameter of 0.231 inches to set specific neck tension based on measured loaded neck diameters.
Wear-Resistant Construction: Heat-treated alloy steel body hardened to Rockwell Rc 60–62 with a hand-polished interior surface.
Die Compatibility: Industry-standard external dimensions of 0.500" outer diameter and 0.375" length ensure fitment across Redding Bushing-style dies and Wilson-style dies.
Brass Longevity: Prevents excessive working of case neck brass and eliminates concentricity issues associated with conventional expander balls.

Product Specifications

Inside Sizing Diameter: 0.231 inches
Outer Diameter: 0.500 inches (1/2")
Length: 0.375 inches (3/8")
Material: Heat-treated alloy steel
Surface Hardness: Rockwell Rc 60–62
Weight: Approximately 15–20 g
Die Compatibility: Redding Type S Neck Dies, Redding Type S Full-Length Dies, Redding Competition Bushing Neck Dies, Wilson-style neck sizing dies

Who is the Redding .231 Heat-Treated Steel Neck Sizing Bushing for?

Precision metallic cartridge reloaders — requiring a steel neck sizing bushing with a 0.231-inch inside diameter to establish 0.001" to 0.002" of neck tension on .20-calibre cartridges (such as .204 Ruger and .20 Tactical) yielding 0.232" to 0.233" loaded round neck measurements.
Australian target shooters and varmint hunters — utilizing tight-neck chambers or neck-turned brass who rely on the hand-polished Rockwell Rc 60–62 hardened surface and standard 0.500" outer diameter to maintain concentricity across Redding Type S and Wilson-style dies.

Less suitable for: Reloaders reducing fired neck diameter by more than 0.004" to 0.005" in a single pass (where multiple intermediate sizing bushings are required to prevent runout), cartridges with loaded neck diameters outside the 0.232"–0.233" range (which require alternative bushing diameters from .185" to .368"), or high-volume reloaders seeking lube-free operation and extended wear, who are better served by a Titanium Nitride (TiN) coated bushing.

SKU	RD41761LP
Model #	73231
Brand	Redding
Shipping Weight	1.0000kg

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Redding 73231 Steel Neck Sizing Bushing .231 Inch Precision Reloading

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