The Redding .212 Heat-Treated Steel Neck Sizing Bushing (MPN: 73212) provides precise dimensional control over cartridge case neck diameter and bullet tension. Engineered for precision metallic handloading, it sizes the exterior neck of cartridge brass without the use of an expander ball, reducing case stretching and maintaining neck concentricity. Manufactured from high-grade steel, each bushing is heat-treated to a hardness of Rockwell C 60–62 and features a hand-polished interior surface to ensure smooth case passage.

Key Features

• Precision Neck Tension: Sizes the case neck to a precise 0.212-inch inside diameter, allowing handloaders to set exact bullet interference fit.
• Reduced Case Runout: Eliminates the need for standard sizing die expander buttons, preventing case neck stretching and runout.
• Heat-Treated Durability: Hardened to Rockwell C 60–62 with a hand-polished internal bore to resist wear and brass galling.
• Die Compatibility: Fits all Redding Type S Bushing Full Sizing Dies, Type S Bushing Neck Dies, Competition Bushing Neck Sizing Dies, and standard Wilson-style neck sizing dies.
• Clear Identification: Features size designations stamped directly onto the top surface for rapid identification.

Specifications

• Manufacturer Part Number (MPN): 73212
• Inside Sizing Diameter: 0.212 inches (5.385 mm)
• Outer Diameter: 1/2 inch (0.500 inches)
• Height: 3/8 inch (0.375 inches)
• Material Hardness: Heat-treated steel (Rockwell C 60–62)
• Weight: Approximately 10–15 grams
• Operation: Manual unpowered reloading tool

Who is the Redding .212 Heat-Treated Steel Neck Sizing Bushing for?

• Small-calibre precision handloaders — requires an exact 0.212-inch inside diameter to establish optimal 0.001-inch to 0.002-inch neck tension on small-calibre cartridges such as the .17 Hornet and .17 Remington with loaded neck diameters measuring between 0.213 and 0.214 inches.
• Reloaders targeting minimal runout — fits standard 1/2-inch by 3/8-inch bushing die cavities to size brass necks externally, eliminating internal expander balls that introduce neck runout and brass fatigue.

Less suitable for: Handloaders whose loaded cartridge necks measure outside the 0.213-inch to 0.214-inch range, who require a different diameter neck sizing bushing; reloaders seeking to size brass without neck lubrication, who are better served by a Titanium Nitride-coated bushing; or handloaders not tailoring neck tension to specific brass wall thicknesses, who are better served by standard non-bushing full-length sizing dies.