What sizing dies are compatible with the Redding 73307 neck sizing bushing?

The Redding 73307 bushing features standard external dimensions of 1/2 inch (0.500") outside diameter and a 3/8 inch (0.375") length. It is designed to freely interchange in all standard Redding Bushing-Style Sizing Dies, including Type S Neck Sizing Dies, Type S Full Length Sizing Dies, Competition Bushing Neck Sizing Dies, and compatible Wilson-style neck dies. Please note it does not fit large-format Magnum dies like those used for .338 Lapua or .50 BMG.

How do I determine if the 0.307 inch internal diameter is the correct size for my brass?

Redding recommends determining your required bushing size by measuring the outside neck diameter of a fully loaded cartridge using a precision micrometer, then subtracting 0.001" to 0.002" to account for brass spring-back. This ensures you achieve the exact bullet neck tension needed without relying on an internal expander ball. The heat-treated steel is hardened to Rockwell Rc 60-62 with a hand-polished interior to maintain consistency across your batch.

Do I need to use case neck lubricant with this heat-treated steel bushing during reloading?

Yes, light external case neck lubrication is explicitly recommended by Redding when using their heat-treated steel bushings to prevent cases from sticking and to ensure smooth operation during the sizing stroke. If you prefer a setup that reduces friction without requiring case neck lubricant, you may want to look at Redding's Titanium Nitride coated bushing alternatives. This mechanical component operates entirely manually on your reloading press, meaning no electrical compliance or 240V power is required for your Australian workbench.

Neck Sizing Bushing - Redding 73307

The Redding .307 Heat-Treated Steel Neck Sizing Bushing (Model 73307) is a precision handloading component engineered to size cartridge case necks to an exact external diameter without requiring an internal expander ball. By eliminating excessive neck sizing and subsequent expanding, this mechanical bushing reduces brass work-hardening and extends cartridge case life while allowing handloaders to precisely set bullet neck tension. It interchanges freely across standard Redding bushing-style reloading dies, including Type S Neck Sizing Dies, Type S Full Length Sizing Dies, and Competition Bushing Neck Sizing Dies, as well as compatible Wilson-style neck sizing dies.

Precise Neck Sizing: Sizes the outside diameter of cartridge case necks to an internal diameter of 0.307 inches (approximately 7.798 mm), providing consistent neck tension without working brass over an expander plug.
Hardened Steel Construction: Heat-treated to a hardness of approximately Rockwell Rc 60–62 and finished with a hand-polished interior surface to reduce sizing friction and prevent brass galling during the reloading stroke.
Standard Die Interface: Features standard external dimensions of 1/2" (0.500") outside diameter by 3/8" (0.375") length for drop-in compatibility across standard-cavity bushing dies.
Extended Case Life: Limits brass deformation strictly to the required sizing dimension, preventing premature neck splitting and overworking.

Product Specifications

Internal Diameter: 0.307 inches (approx. 7.798 mm)
Outside Diameter: 1/2 inch (0.500 inches)
Length: 3/8 inch (0.375 inches)
Material: Heat-treated steel
Hardness: Rockwell Rc 60–62
Die Compatibility: Standard Redding Type S Neck, Type S Full Length, and Competition Bushing Sizing Dies; Wilson-style neck dies

Who is the Redding .307 Heat-Treated Steel Neck Sizing Bushing for?

Precision handloaders tuning ammunition for benchrest and long-range shooting — requires exact 0.307-inch internal diameter sizing in a steel neck sizing bushing to maintain uniform bullet release and precise neck tension across matched brass lots without using an expander ball.
Handloaders managing brass neck wall thickness for specific cartridge variants — relies on the 0.307-inch interior sizing dimension and Rockwell Rc 60–62 hardness of this neck sizing bushing to size specific cartridge and neck-wall thickness combinations down to 0.001 to 0.002 inches below loaded cartridge dimensions.

Less suitable for: Reloaders running large-format magnum dies such as .338 Lapua or .50 BMG oversize dies, which exceed the 1/2-inch (0.500-inch) outside diameter threshold and require larger external-diameter magnum neck sizing bushings.

SKU	RD41773LP
Model #	73307
Brand	Redding
Shipping Weight	1.0000kg

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Redding 73307 Steel Neck Sizing Bushing 0307 Inch Reloading

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