The Redding .284 Winchester Competition Bushing Neck 3-Die Set (SKU 58141) is a precision reloading tool engineered for handloaders shooting fire-formed brass through dedicated bolt-action chambers. Built on standard 7/8"-14 reloading press threads, this three-die set includes a micrometer-adjustable Competition Bushing Neck Sizing Die, an independent Body Die for shoulder-bump operations without neck contact, and a Competition Bullet Seating Die with a 0.001-inch graduated micrometer head. Constructed from heat-treated alloy steel with an approximate packaged weight of 0.7 to 0.9 kg, the set maintains bullet-to-case alignment and minimizes runout for tight sub-MOA consistency.

Key Features

• Internal Sliding Sleeve Design: Both the neck sizing and bullet seating dies utilize internal sliding alignment sleeves that completely capture and support the 7mm cartridge case before sizing or seating, eliminating bullet tilt and case runout.
• Bushing Neck Sizing: Accommodates interchangeable sizing bushings spanning 0.310" to 0.318" (sold separately), allowing users to adjust neck tension in exact 0.001-inch increments without an internal expander ball.
• Dual Micrometer Adjustments: Features calibrated 0.001-inch micrometer adjustment heads on both the neck sizing die (for precise bushing positioning) and the bullet seating die (for precise cartridge overall length).
• Dedicated Body Die: Bumps the cartridge shoulder back and sizes the case body walls independently without making contact with the case neck, preserving tailored neck tension.
• Shellholder Compatibility: Functions with industry-standard single-stage and turret presses utilizing a standard #1 shellholder (Part #11001) or Redding Competition Shellholder #1 (Part #11601).

Specifications

• Calibre Compatibility: .284 Winchester (7mm / 0.284" bullet diameter)
• Thread Pitch: Industry-standard 7/8"-14 threads
• Bushing Compatibility Range: 0.310" to 0.318" diameter Redding bushings
• Micrometer Graduation: 0.001" increments
• Included Dies: Competition Bushing Neck Sizing Die, Body Die, Competition Bullet Seating Die
• Material: Heat-treated alloy steel
• Packaged Weight: Approximately 0.7–0.9 kg
• Power Requirements: None (manual reloading equipment)

Who is the Redding 284 Winchester Competition Neck Die Set for?

• F-Class Open Long-Range Precision Shooters — Requires this reloading neck die set to dial in specific neck tension between 0.001" and 0.002" using the 0.310" to 0.318" bushing compatibility range for match-grade .284 Winchester loads.
• Match Rifle Handloaders Firing Fire-Formed Brass — Benefits from using this .284 Winchester die set on 7/8"-14 reloading presses to bump shoulders independently via the dedicated body die while preserving fire-formed case dimensions.
• Benchrest Shooters Requiring Tight Concentricity Control — Relies on this reloading neck die set's internal sliding sleeves to guide the 0.284-inch bullet and case straight into the die, eliminating runout across precision-machined 7/8"-14 press setups.

Less suitable for: Handloaders cycling ammunition through semi-automatic rifles, mixed-chamber firearms, or resizing brass fire-formed in foreign chambers (or necked-up parent brass), who require full-length sizing dies or small-base sizing dies to ensure reliable chambering clearance.