The Redding 338 Lapua Magnum Competition Neck Die Set (MPN: 58594) is a mechanical, precision handloading tool designed for reloading match-grade .338 Lapua Magnum ammunition. Weighing approximately 2.00 lbs (~0.91 kg), this three-die set includes a Competition Bushing Neck Sizing Die (#56594), a Body Die (#75594), and a Competition Seating Die (#55594). Built with standard 7/8"-14 threads, the set utilizes internal sliding sleeve alignment mechanisms and micrometer-adjustable tops to ensure minimal concentricity runout and precise cartridge dimensions for extreme long-range target shooting and precision hunting applications.

Key Features

• Micrometer Adjustments: The neck sizing die and seating die feature micrometer tops calibrated in direct 0.001" increments to fine-tune neck bushing sizing depth and bullet seating depth.
• Sliding Sleeve Alignment: A close-tolerance internal chamber sleeve fully supports and aligns the .338 Lapua Magnum cartridge case and bullet before sizing or seating operations commence.
• Expander-Free Bushing Sizing: Uses interchangeable neck sizing bushings (recommended 0.360" to 0.368", sold separately) without an expander ball, preventing overworking of brass and preserving neck concentricity.
• Dedicated Body Die: Resizes the full-length case body dimensions and bumps the shoulder back without contacting the case neck, allowing body maintenance only when required.
• Universal Press Interface: Machined with industry-standard 7/8"-14 thread pitch, ensuring compatibility with standard reloading presses and #35 shellholders.

Product Specifications

• Calibre: .338 Lapua Magnum (0.338" bullet diameter)
• Die Set Contents: Competition Bushing Neck Sizing Die, Body Die, Competition Seating Die
• Thread Interface: Standard 7/8"-14
• Adjustment Graduations: 0.001" micrometer increments
• Recommended Bushing Range: 0.360" to 0.368"
• Shellholder Compatibility: Standard or Competition Shellholder #35
• Weight: Approx. 2.00 lbs (0.91 kg)
• Operating Mechanism: Manual / purely mechanical

Who is the Redding 338 Lapua Magnum Competition Neck Die Set for?

• Extreme long-range precision handloaders — requires the 0.001" micrometer adjustments and tight-tolerance sliding sleeve alignment of this 338 Lapua Magnum neck die set to minimise bullet runout and control exact neck tension for targets at 800 m to beyond 2,000 m.
• Benchrest and PRS shooters using 338 Lapua Magnum rifles — benefits from the standard 7/8"-14 thread interface and independent body die, which allows shooters to size fire-formed brass from the same bolt-action chamber without working the case neck until shoulder bump is necessary.

Less suitable for: Handloaders processing mixed-chamber brass or running semi-automatic and gas-operated rifles that require routine full-length neck-and-body sizing in one step; a dedicated standard full-length sizing die or Type S full-length die set is better suited for those operations.