The Redding 55139 Competition Seating Die is a precision straight-line bullet seating tool engineered specifically for reloading 7mm-08 Remington cartridges using 0.284-inch projectiles. Operating manually without electrical power, it features a patented alignment system where a close-fitting, spring-loaded sliding chamber fully captures and aligns both the cartridge case and bullet along a concentric axis before the seating process begins. Equipped with an industry-standard 7/8"-14 TPI thread, it mounts directly into standard single-stage and progressive reloading presses.

Key Features

• Straight-Line Guided Alignment: Utilises an internal floating chamber sleeve that supports the entire cartridge case and projectile, keeping them perfectly concentric to eliminate bullet runout.
• Micrometer Depth Adjustment: Features a top-mounted micrometer head graduated in 0.001" increments with zero-reset capability for exact, repeatable control over Cartridge Overall Length (COAL) and bullet jump.
• Precision Ground Seating Stem: Employs a precision ground, non-crimping standard seating stem (Part #55048) designed to prevent projectile deformation during seating.
• Dedicated Non-Crimping Operation: Eliminates the built-in crimp shoulder to maintain critical case-to-bullet alignment and prevent concentricity distortion during precision loading.

Specifications

• Calibre Compatibility: 7mm-08 Remington (0.284" / 7mm bullet diameter)
• Mounting Thread: 7/8"-14 TPI
• Adjustment Graduations: 0.001"
• Standard Shellholder Compatibility: Redding #1 or Redding Competition Shellholders
• Standard Seating Stem: Part #55048 (optional VLD stem #55748 supported)
• Unboxed Weight: Approximately 350 g to 450 g
• Operation: Manual mechanical

Who is the Redding Competition Seating Die for 7mm-08 Remington for?

• 7mm-08 Remington long-range precision shooters — requires precise Cartridge Overall Length control, which this competition seating die provides via a micrometer head calibrated in 0.001" graduations with standard 7/8"-14 TPI press compatibility.
• F-Class and benchrest handloaders — focuses on minimising bullet runout in 7mm-08 Remington cartridges by using a dedicated straight-line sliding sleeve and a non-crimping stem with 0.001" micro-adjustability.

Less suitable for: Handloaders seeking to seat non-7mm-08 Remington calibres like 7mm Rem Mag or 7x57mm (use a calibre-specific seating die) or those requiring a built-in crimp in a single operation (use a dedicated separate crimp die or standard seating die with an integrated crimping shoulder).