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Manufacturers Redding

Redding Expander Mandrel 0.2825

$79.00 incl GST

Redding Reloading Equipment: Total Quality Since 1946

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21537

Redding, Accessories, New Unleashed Products

Specifications

brand: Redding
equipment: mandrel

Description

Redding Expander Mandrel 0.2825

The Redding Expander Mandrel 0.2825 (Part No. 21537) is a precision reloading component designed to uniform and control the internal diameter of cartridge case necks for .284 / 7mm calibers.

It is manufactured from hardened tool steel and precision-ground to exact tolerances, ensuring smooth, consistent expansion of the case neck and improved concentricity.

This mandrel is part of the Redding Precision Expanding Die system and is used by reloaders who want fine control over neck tension, a key factor in achieving consistent accuracy.
 

Best Suited For

  • Precision and long-range rifle reloaders
  • .284 / 7mm caliber cartridges (e.g., 7mm-08, .280 Rem, 7mm Rem Mag)
  • Shooters seeking consistent neck tension and bullet seating
  • Competitive shooters and accuracy-focused handloaders
  • Users of Redding Precision Expanding Die systems

When To Use It

  • After full-length or neck sizing to standardize case neck ID
  • When optimizing neck tension for specific bullets or loads
  • During precision load development
  • To improve case neck concentricity and uniformity
  • As an alternative to traditional expander balls for better consistency

Mandrels are typically used in a workflow where the neck is sized slightly smaller, then expanded to a precise dimension for uniform bullet grip.

Technical Information

  • Product Code: 21537
  • Mandrel Diameter: 0.2825"
  • Caliber Compatibility: .284 / 7mm
  • Material: Hardened, precision-ground tool steel
  • Manufacturing: CNC machined and heat-treated for durability
  • Use Requirement: Designed for use with Redding Precision Expanding Die (sold separately)

FAQs

Q: Do I need a die body to use this?
Yes. This mandrel is used with the Redding Precision Expanding Die.

Q: Why use a mandrel instead of an expander ball?
Mandrels generally provide better concentricity and more consistent neck tension, which can improve accuracy.

Q: Is it reusable?
Yes. The hardened steel construction ensures long lifespan with proper maintenance.

Delivery & Compliance

  • Classified as a reloading tool, not ammunition
  • Generally no firearms license required (including NZ), but check local laws

Questions?

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