The Redding 308 Win Micro Adjustable Taper Crimp Die (MPN 31155) provides precise, repeatable taper crimping for .308 Winchester and 7.62×51mm NATO ammunition. Featuring a top-mounted knurled micrometer barrel, this die allows reloaders to fine-tune crimp dimensions directly without loosening the lock ring or unthreading the die body from the press. It applies uniform case-mouth retention to eliminate bullet setback under feeding and recoil pressures without deforming non-cannelured projectiles.

Key Features

• Top-Mounted Micrometer Head: Offers ±0.100″ of total on-the-fly linear adjustment indexed in exact 0.001″ graduations.
• Independent Crimp Adjustment: Adjusts crimp depth without altering the primary die body position or disturbing the lock ring setting.
• Hardened Steel Construction: Contains a dedicated, free-floating internal crimping sleeve engineered for long-term consistency.
• Toolhead Efficiency: Streamlines setups in tight progressive and turret toolheads where accessing conventional lock rings is restricted.
• Universal Thread Interface: Mounts to any standard single-stage, turret, or progressive reloading press using 7/8"-14 threads.

Specifications

• Manufacturer Part Number (MPN): 31155
• Calibre Compatibility: .308 Winchester / 7.62×51mm NATO
• Thread Standard: 7/8"-14
• Adjustment Range: ±0.100″
• Adjustment Increments: 0.001″
• Material: Hardened steel internal sleeve and die body
• Operation: Manual, purely mechanical (non-powered)
• Packaging Weight: Approximately 0.3 kg (0.7 lbs)

Who is the Redding 308 Win Micro Adjustable Taper Crimp Die for?

• Semi-automatic .308 Winchester reloaders — Requires exact crimp tension across .308 Winchester rounds to prevent bullet setback during aggressive cycling, using this micrometer adjustable taper crimp die to adjust crimp depth in precise 0.001″ increments across ±0.100″ of linear travel.
• Service rifle competitive shooters — Needs rapid, repeatable compensation for minor lot-to-lot case neck thickness variances on 7/8"-14 threaded toolheads without loosening the die lock ring, utilizing the die's 0.001″ micrometer adjustments to secure non-cannelured match projectiles uniformly.

Less suitable for: Precision bolt-action target shooting where bullet retention is adequately maintained purely through consistent neck tension, or high-recoil magnum cartridges requiring heavy roll crimps into deep projectile grooves, which are better served by a dedicated roll crimp die or profile crimp die.