The Redding .307 Titanium Nitride Neck Sizing Bushing is a precision reloading component engineered to size cartridge case necks to an exact dimension, giving handloaders precise control over neck tension and bullet grip without overworking brass. Machined from heat-treated steel with a base core hardness of approximately Rc 60–62, the bushing features a low-friction Titanium Nitride (TiN) surface coating that reduces resizing drag. Designed with standard external dimensions, it freely self-centers on the case neck axis when used in Redding Type S Bushing Neck Dies, Type S Full Length Sizing Dies, and standard Wilson-style neck bushing dies.

Key Features

• Precision Neck Sizing: Delivers an exact 0.307-inch inside diameter to set consistent bullet release and neck tension across brass lots.
• Titanium Nitride Coating: Low-friction TiN surface treatment enhances surface hardness and reduces sizing effort compared to standard bare-steel bushings.
• Self-Centering Operation: Floats freely within compatible Type S die bodies to align naturally with the cartridge case neck axis during the press stroke.
• Clear Size Identification: Stamped with .307 on the exterior surface for immediate identification on the reloading bench.

Specifications

• Inside Sizing Diameter: 0.307 inches
• Substrate Material: Heat-treated steel
• Core Hardness: Approximately Rc 60–62
• Surface Treatment: Titanium Nitride (TiN)
• Die Compatibility: Redding Type S Bushing Neck Dies, Redding Type S Full Length Sizing Dies, Wilson-style neck dies
• Weight: Approximately 15–30 grams
• Operation: Manual reloading press stroke (single-case pass)

Who is the Redding .307 Titanium Nitride Neck Sizing Bushing for?

• Precision handloaders tuning cartridge neck tension — requires an exact 0.307-inch inside diameter to establish 0.001-inch to 0.002-inch bullet grip on brass with loaded neck diameters measuring 0.308 to 0.309 inches, supported by a durable Rc 60–62 steel substrate.
• Benchrest competitors seeking consistent bullet release — relies on the low-friction TiN coating over an Rc 60–62 core to minimise resizing drag and maintain uniform neck dimensions across match brass.
• Reloaders utilizing thin-walled 7mm or .30-cal setups — benefits from this 0.307-inch neck sizing bushing when forming neck-turned 7mm variants (such as 7mm-08 or .284 Win) or specific thin-wall .30-calibre cartridges requiring controlled dimensional reduction.

Less suitable for: Handloaders whose loaded cartridge case neck diameters measure outside the 0.308-inch to 0.309-inch target range, who require adjacent bushing sizes across the 0.185-inch to 0.368-inch spectrum, or those using unturned brass with non-uniform neck walls better served by a standard full-length sizing die with an expander ball.