Will the Redding 73186 steel bushing require case neck lubrication during operation?

Yes, standard heat-treated steel bushings like the Redding 73186 require case necks to be lubricated prior to sizing. If you prefer a dry or lube-free neck sizing process, we recommend looking into Redding's Titanium Nitride coated bushing series with the model prefix 76XXX instead.

What sizing dies are compatible with the Redding .186 Heat-Treated Steel Neck Sizing Bushing?

The Redding 73186 features standard dimensions of a 1/2-inch outer diameter and 3/8-inch length, allowing it to freely interchange with all Redding bushing-style sizing dies—such as Type S Bushing Neck Dies, Type S Full Length Dies, and Competition Bushing Neck Sizing Dies—as well as Wilson-style neck sizing dies.

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

No electrical compliance or SAA/RCM certifications are required for the Redding 73186. Because it is a purely mechanical, non-electrical reloading component, it is unrestricted for purchase and use by sport shooters and handloaders across all Australian states and territories.

How much can I reduce the neck diameter in a single sizing step with this 0.186-inch bushing?

Standard precision reloading practice recommends reducing neck diameter by no more than 0.004 to 0.005 inches in a single sizing step to prevent brass distortion and premature fatigue. For greater reductions, you will need to use intermediate bushing steps.

Neck Sizing Bushing - Redding 73186

The Redding .186 Heat-Treated Steel Neck Sizing Bushing (MPN: 73186) provides precise control over cartridge case neck diameter and bullet tension in 0.001-inch increments. Manufactured from high-grade steel hardened to Rockwell C 60–62, this bushing features hand-polished sizing surfaces to reduce friction during the sizing stroke and prevent premature work-hardening of cartridge brass. Built to standard 1/2-inch outer diameter and 3/8-inch length dimensions, it freely interchanges with all Redding Bushing-style sizing dies—including Type S Bushing Neck Dies, Type S Full Length Dies, and Competition Bushing Neck Sizing Dies—as well as Wilson-style neck sizing dies.

Precision Neck Sizing: Features an internal diameter of 0.186 inches (4.724 mm) to set neck tension precisely on small-calibre cases without over-working the brass.
Wear-Resistant Construction: Heat-treated steel construction rated at Rockwell C 60–62 ensures dimensional stability and extended service life under repeated reloading cycles.
Low-Friction Finish: Hand-polished internal surfaces minimize resistance during case entry and extraction, reducing neck runout and brass fatigue.
Standardized Fit: Measures 1/2-inch outer diameter by 3/8-inch length for complete interchangeability across Redding Type S, Redding Competition, and Wilson-style bushing dies.

Product Specifications

Internal Diameter (ID): 0.186 inches (4.724 mm)
External Dimensions: 1/2-inch outer diameter (O.D.) x 3/8-inch length
Material: High-grade carbon steel
Hardness: Heat-treated to Rockwell C 60–62
Internal Finish: Hand-polished sizing surface
Die Compatibility: Redding Type S Neck & Full Length Dies, Redding Competition Bushing Dies, Wilson-style neck sizing dies
Manufacturer Part Number (MPN): 73186

Who is the Redding .186 Heat-Treated Steel Neck Sizing Bushing for?

Precision handloaders reloading sub-calibre precision cartridges — requires an exact 0.186-inch internal diameter steel neck sizing bushing to maintain consistent bullet-release tension and minimize neck runout on sub-calibre brass.
Varmint hunters reloading .17 calibre cartridges — utilizes the 0.186-inch internal diameter sizing dimension of this steel neck sizing bushing to precisely size .17 calibre cartridge variants such as .17 Hornet, .17 Fireball, or .17 Remington based on loaded case neck thickness.
Benchrest shooters utilizing Redding bushing-style sizing dies — relies on standard 1/2-inch outer diameter by 3/8-inch length steel neck sizing bushings heat-treated to Rockwell C 60–62 for repeatable, low-friction neck sizing in Redding Type S or Competition dies.

Less suitable for: Handloaders sizing cartridges that require an outside neck diameter other than 0.186 inches (requiring different bushing sizes ranging from 0.185 inches to 0.368 inches), reloaders reducing neck diameters by more than 0.004 to 0.005 inches in a single pass (requiring intermediate step-down bushings), or users requiring a dry, lube-free sizing operation (better served by a Titanium Nitride coated bushing).

SKU	RD41745LP
Model #	73186
Brand	Redding
Shipping Weight	1.0000kg

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Redding 73186 Steel Neck Sizing Bushing .186 Id Heat Treated

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