The Redding .364 Heat-Treated Steel Neck Sizing Bushing (MPN: 73364) is a precision reloading component engineered to regulate case neck tension and bullet grip on metallic rifle cartridges. Built with an internal sizing diameter of 0.364 inches, it sizes the exterior of cartridge necks without overworking the brass, eliminating the need for standard internal expander buttons. The bushing is constructed from heat-treated steel hardened to Rockwell C 60–62 and features a hand-polished interior surface to reduce sizing drag and prevent brass galling during the reloading cycle.

Key Features

• Precise 0.364-Inch Internal Sizing: Maintains uniform neck tension for cartridge setups by precisely sizing neck outer diameters, with the size etched directly onto the exterior for identification.
• Rockwell C 60–62 Hardened Steel: Heat-treated and hand-polished internal surface minimizes friction and brass dragging, extending brass life when used with case neck lubricant.
• Standardized Die Fit: Features a standardized 1/2-inch outer diameter and 3/8-inch height, providing cross-compatibility with standard bushing dies.
• Interchangeable Design: Freely interchanges across Redding Type S Neck Sizing Dies, Type S Full Length Sizing Dies, Competition Neck Sizing Dies, and standard Wilson-style bushing dies.

Specifications

• Manufacturer Part Number (MPN): 73364
• Category: Reloading neck sizing bushing
• Material: Heat-treated steel, hand-polished interior
• Surface Hardness: Rockwell C 60–62 (Rc 60–62)
• Internal Sizing Diameter: 0.364 inches
• Outer Diameter (O.D.): 1/2 inch (0.500 in)
• Length / Height: 3/8 inch (0.375 in)
• Weight: Approximately 0.046–0.1 lb (20–45 g) packaged
• Power Requirements: None (manual benchtop reloading component)
• Die Compatibility: Redding Type S Full Length, Type S Neck, Competition Neck, and standard Wilson bushing dies

Who is the Redding .364 Heat-Treated Steel Neck Sizing Bushing for?

• Precision Handloaders — requiring an exact 0.364-inch internal sizing diameter to achieve 0.001 to 0.002 inches of bullet grip on loaded cartridge necks measuring 0.365 to 0.366 inches across.
• Target Shooters and Hunters — utilising standard 1/2-inch outer diameter and 3/8-inch long bushing dies to improve concentricity and muzzle velocity consistency by eliminating expander button pull-through.

Less suitable for: Reloaders processing brass where neck wall thickness variation exceeds 0.002 inches, which produces inconsistent internal diameters unless an expander-mandrel die system is used, or non-bushing standard reloading dies and large-calibre dies requiring 7/8-inch outer diameter bushings.