Does the Redding 81138 neck sizing die require any special electrical certification or power supply for use in Australia?

No electrical compliance or SAA/RCM certification is required. The Redding 7x57 Mauser Neck Sizing Die is a completely unpowered, manually operated mechanical tool with no electrical components.

Can I use the neck-sized brass produced by this die in my semi-automatic or lever-action 7x57mm rifles?

No. Neck-sized brass is strictly recommended only for bolt-action and single-shot rifles, as semi-automatic, pump-action, or lever-action firearms require full-length resizing to ensure reliable chambering and extraction.

What shellholder do I need to use the Redding 7x57 Mauser Neck Sizing Die on my standard reloading press?

This die features a standard 7/8"-14 thread that screws directly into most presses used in Australia, such as Redding, RCBS, Lyman, Lee, and Hornady. You will need a Redding Shellholder #1 (Part #11001) or any standard universal #1 shellholder to hold the 7x57mm Mauser casing.

How often do I need to full-length resize or body size cases when exclusively using this neck sizing die?

After approximately 3 to 5 firings, case bodies and shoulders will gradually expand to the point where chambering resistance occurs. At that threshold, you must use a body die or full-length sizing die to reset the case dimensions.

7x57mm Neck Die - Redding 81138

The Redding 7x57 Mauser Neck Sizing Die (MPN: 81138) is a precision reloading tool engineered to resize only the neck of fire-formed 7x57mm Mauser cartridge cases. Machined from heat-treated, case-hardened alloy steel, this die restores factory neck tension for .284 in (7.21 mm) diameter bullets while leaving the case body and shoulder dimensions untouched. By preserving the exact fire-formed geometry of your rifle's chamber, it maximizes shot-to-shot concentricity and significantly extends brass working life by preventing unnecessary brass fatigue.

Key Features

Neck-Only Resizing: Returns case necks to proper tension without working or sizing the case body or shoulder.
Simultaneous Decapping and Expanding: Integrates a decapping rod assembly (#24283), standard decapping pin (#01060), and steel expander button (#40283) to decap spent primers and size the internal neck diameter in one pass.
Extended Case Life: Minimizes case stretching and work-hardening, drastically cutting down on case trimming frequency.
Standard Thread Compatibility: Built with industry-standard 7/8"-14 threading to fit all standard reloading presses.

Product Specifications

Calibre Compatibility: 7x57mm Mauser (7mm Mauser / 7x57mm)
Bullet Diameter: .284 in (7.21 mm)
Thread Size: Standard 7/8"-14 thread
Shellholder Requirement: Redding Shellholder #1 (Part #11001) or universal #1 shellholder (sold separately)
Material: Case-hardened alloy steel
Dimensions & Weight: Approximately 11 cm in height; weight 200–250 g
Power Requirements: None (purely mechanical operation)

Who is the Redding 7x57 Mauser Neck Sizing Die for?

Bolt-Action 7x57mm Hunters — Reloads fire-formed brass for bolt-action rifles by maintaining the chamber-matched dimensions of .284 in (7.21 mm) diameter 7x57mm Mauser cartridges, improving concentricity and accuracy in the field.
Precision Handloaders Seeking Brass Longevity — Extends case life across standard 7/8"-14 thread reloading presses by sizing only the neck area, eliminating the cycle of body overworking and reducing case trimming.

Less suitable for: Semi-automatic, lever-action, or pump-action firearms, as neck-sized brass must only be chambered in the exact rifle that fired it; handloaders running these action types, or brass that has reached 3 to 5 firings and developed chambering resistance, should use a full-length sizing die or dedicated body die instead.

SKU	RD41902LP
Model #	81138
Brand	Redding
Shipping Weight	1.0000kg

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Redding 81138 Neck Sizing Die 7x57mm Mauser Steel

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