The Redding Precision Expanding Die w/ 0.2230 Expanding Mandrel is a dedicated reloading die engineered to expand the inside diameter of resized rifle case necks. Designed for .22 calibre cartridges utilising standard 0.224-inch nominal bullet diameters, this tool establishes uniform neck tension and bullet seating resistance while minimising runout. Constructed from CNC-machined, heat-treated steel, the die body holds a precision-ground, hardened tool-steel expanding mandrel using angled mating surfaces to prevent tilt and maintain axial alignment during the expanding stroke.

Key Features

• Precise Neck Expansion: Comes equipped with a 0.2230-inch mandrel (0.0010 inches under nominal 0.224-inch bullet diameter) to set precise inside-neck dimensions for consistent bullet release force.
• Self-Centring Alignment: Angled internal mating surfaces paired with a threaded retention plug and lock ring secure the mandrel to prevent tilt and ensure concentric alignment with the case neck.
• Universal Press Mounting: Features an industry-standard 7/8"-14 thread pitch to fit single-stage and turret reloading presses.
• Modular Calibre System: The die body accepts interchangeable Redding mandrels, allowing incremental tension adjustments across 0.0005-inch steps (available from 0.2210 to 0.2235 inches for .22 calibre).

Product Specifications

• Manufacturer Part Number (MPN): 21506
• Die Body Material: CNC-machined, heat-treated steel
• Mandrel Material: Precision-ground, hardened tool steel
• Thread Pitch: 7/8"-14 standard reloading press thread
• Calibre Suitability: .22 calibre (.224-inch nominal projectile diameter, including .223 Rem, .22-250 Rem, .22 ARC, and .22 Creedmoor)
• Supplied Mandrel Diameter: 0.2230 inches
• Power Requirements: None (manual mechanical operation)

Who is the Redding Precision Expanding Die W/0.2230 Expanding Mandrel for?

• Precision long-range target shooters — establishes uniform neck tension on match-grade .22 calibre cartridges using the 0.2230-inch mandrel, which sizes the case mouth 0.0010 inches below standard 0.224-inch projectile diameters to deliver consistent bullet release forces across single-stage loading workflows.
• Varmint hunters — eliminates neck runout and uneven bullet grip in high-accuracy .22-calibre handloads via a precision case neck expanding die that mounts directly into any standard 7/8"-14 thread pitch press.

Less suitable for: High-volume, bulk ammunition reloaders using progressive presses, or operators attempting to expand un-resized fired brass without prior body sizing; these workflows are better served by standard full-length sizing dies with integrated expander balls.