What level of bullet seating tension does the 0.2220 inch mandrel provide for standard .224 inch projectiles?

The Redding 21503 expanding mandrel features an outer diameter of 0.2220 inches, which provides precisely 0.0020 inches of neck tension or interference fit when used with standard .224 inch bullets. This exact uniform inside diameter helps benchrest and precision handloaders achieve extreme concentricity and minimise bullet runout.

What die body do I need to use with the Redding 0.2220 Expanding Mandrel?

This mandrel requires the Redding Precision Expanding Die body, which is sold separately and features a threaded retention plug and angled alignment surfaces. To ensure optimal performance during your reloading session, it is also recommended to pair your setup with quality case neck lubricants like Redding Imperial Sizing Die Wax.

What are the pre-requisites for the brass case necks before running them over this mandrel?

Before using the 0.21503 mandrel, the inside diameter of your brass case necks must already be sized smaller than 0.2220 inches, typically by removing the expander ball from your sizing die or using factory-undersized new brass. If fired brass is not resized smaller than this threshold first, the mandrel will not perform any expansion.

Are there any special Australian regulatory compliance or electrical requirements for this tool?

As a purely mechanical and unpowered reloading component made of CNC-machined tool steel, electrical specifications like 240V compatibility and SAA or RCM certifications do not apply. The item is unrestricted for purchase and use across all Australian states and territories as standard reloading hardware.

.22 Calibre Mandrel - Redding 21503

The Redding Precision Expanding Mandrel 0.2220 (Model 21503) is a dedicated case preparation component engineered to standardise the inside diameter of .22 calibre brass case necks. Designed for use exclusively within the Redding Precision Expanding Die body, this mandrel sizes the interior neck diameter to exactly 0.2220", establishing a precise .0020" neck tension (interference fit) when seating standard .224" nominal diameter projectiles. Machined from CNC-machined high-quality tool steel, hardened, and precision-ground to final diameter, it eliminates the brass runout frequently introduced by traditional sizing die expander balls.

Key Features

Precise .0020" Neck Tension: Finishes the inner neck diameter to 0.2220", providing consistent bullet grip and uniform release pressure across standard .224" projectiles.
Smooth Tapered Nose: Facilitates concentric, progressive entry into undersized or new brass case mouths without buckling or collapsing case shoulders.
Concentric Alignment: Works in conjunction with the angled internal surfaces and threaded retention plug of the Redding Precision Expanding Die body to preserve strict neck-to-body runout tolerances.
Hardened Tool Steel: Precision-ground tool steel construction resists wear across high-volume brass processing cycles and features clear size markings on the head.

Specifications

Model Number: 21503
Calibre: .22 Calibre
Nominal Bullet Diameter: .224"
Mandrel Outer Diameter: 0.2220"
Established Neck Tension: .0020" (with standard .224" projectiles)
Material: Hardened, CNC-machined tool steel
Die Compatibility: Redding Precision Expanding Die body

Who is the Redding 0.2220 Expanding Mandrel for?

Benchrest and Precision Rifle Handloaders — Setting inside neck diameter to precisely 0.2220" using this expanding mandrel establishes an exact .0020" interference fit on .224" bullets while eliminating expander-ball-induced runout during dedicated expanding steps.
Varmint Handloaders — Uniforming high-volume .223 Remington, .22-250 Remington, .22 ARC, and .220 Swift brass to a consistent 0.2220" inner dimension ensures repeatable bullet release and tight grouping across diverse brass brands with varied neck wall thicknesses.

Less suitable for: Handloaders processing non-.22 calibre brass, as the 0.2220" outer diameter is physically incompatible with case mouths sized for projectiles larger or smaller than .224", or cartridges where the inside neck diameter has not been pre-sized below 0.2220"; shooters requiring different neck tensions should select calibre-specific mandrels incremented between 0.2210" and 0.2235", or alternative-calibre expander mandrels.

SKU	RD41482LP
Model #	21503
Brand	Redding
Shipping Weight	1.0000kg

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Redding 21503 Expanding Mandrel .22 Calibre 02220 Tool Steel

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