The Redding .365 Heat-Treated Steel Neck Sizing Bushing (Model 73365) is a precision reloading component engineered to calibrate cartridge case neck tension without the use of an internal expander ball. By eliminating the expander button, this bushing reduces brass work-hardening and minimizes case neck runout. It is manufactured from heat-treated steel hardened to Rockwell C 60–62 and features hand-polished internal surfaces to ensure smooth sizing operations.

Key Features

• Internal Diameter Sizing: Features an etched 0.365-inch internal diameter to apply precise bullet grip and neck tension.
• Hardened Steel Construction: Heat-treated to Rc 60–62 hardness to resist wear and maintain dimensional consistency over extended reloading cycles.
• Hand-Polished Interior: Precision-polished internal radius reduces brass friction and galling during the sizing stroke.
• Universal Die Fit: Built to standard 1/2-inch outer diameter and 3/8-inch height dimensions, freely interchanging across Redding Type S Neck Sizing Dies, Type S Full Length Dies, Competition Neck Sizing Dies, and Wilson-style bushing dies.

Product Specifications

• Internal Diameter (I.D.): 0.365 inches
• Outer Diameter (O.D.): 1/2 inch
• Height: 3/8 inch
• Material: Heat-treated steel
• Surface Hardness: Rockwell C 60–62 (Rc 60–62)
• Weight: Under 30 grams
• Compatibility: Redding Type S Bushing Full Length and Neck Dies, Redding Competition Bushing Dies, Wilson-style bushing dies

Who is the Redding .365 Heat-Treated Steel Neck Sizing Bushing for?

• Australian long-range hunters reloading large magnum calibres — requires a 0.365-inch internal diameter steel neck sizing bushing to establish consistent neck tension on large rifle brass where the loaded cartridge neck minus desired tension measures exactly 0.365 inches.
• Precision Rifle Series (PRS) competitors — relies on the Rockwell C 60–62 hardness rating and hand-polished interior of this steel neck sizing bushing to eliminate expander ball friction and prolong case life across repeated firings.

Less suitable for: Reloaders working with brass dimensions requiring internal diameters outside the standard 0.185 to 0.368-inch range (such as .50 BMG or oversized custom calibres), who require large-format sizing dies, or those wanting to size case necks without applying case lubricant, who require Titanium Nitride (TiN)-coated bushings.