The Redding Type S Bushing Neck Die Set for .243 Winchester Improved 40° (Item No. 78420) is a precision 3-die reloading system designed to size fire-formed cartridge brass and seat bullets. Machined with industry-standard 7/8"-14 threads, this mechanical set includes a Type S Bushing Neck Sizing Die, a dedicated Body Die, and a standard Bullet Seating Die. It enables handloaders to precisely regulate neck tension on .243" (6mm) diameter projectiles while preventing brass overworking and maintaining cartridge concentricity for improved case life.

Key Features

• 3-Die System: Includes a Type S Bushing Neck Die, a Body Die for bumping the 40° shoulder and resizing the case body, and a standard Bullet Seating Die.
• Interchangeable Bushings: Utilises self-centring, freely floating steel or titanium-nitride bushings (available in .001" increments, sold separately) to set exact neck tension without overworking brass.
• Adjustable Sizing Depth: Decapping rod adjusts vertically to allow full-length or partial neck sizing, preserving fire-formed case-to-chamber alignment.
• Configurable Decapping Assembly: Supplied with both an expander button for standard commercial brass and a decapping pin retainer for buttonless sizing on neck-turned brass.
• Dedicated Body Die: Restores body dimensions and bumps the 40° shoulder without contacting the neck or altering established neck tension.

Specifications

• Product Type: 3-Die Bushing Neck Die Set
• Calibre Compatibility: .243 Winchester Improved 40° (fire-formed brass)
• Bullet Diameter Compatibility: .243" (6mm)
• Die Thread Interface: 7/8"-14 standard reloading press threading
• Included Dies: Type S Bushing Neck Sizing Die, Body Die, Standard Bullet Seating Die
• Approximate Packaged Weight: 0.65 kg to 0.75 kg
• Power Requirements: Manual mechanical operation (unpowered)

Who is the Redding Type S Neck Die Set for .243 Win Ackley Improved for?

• Handloaders loading for 243 Winchester Improved 40° bolt-action rifles — provides dedicated 7/8"-14 threaded tooling to resize fire-formed cases and seat .243" bullets for chambers cut specifically to 40° Ackley dimensions.
• Long-range precision shooters seeking minimal case runout and extended brass life — uses interchangeable bushings in this neck die set to size .243" brass necks without over-working the brass or disturbing fire-formed chamber alignment.

Less suitable for: Handloaders preparing ammunition for semi-automatic or lever-action firearms; switch to a Type S Full-Length Bushing Die to ensure reliable cycling and chambering clearance across non-bolt-action platforms.