Will the Redding 81527 neck sizing die work with my standard Australian reloading press?

Yes, this die features a standard 7/8"-14 thread mounting interface, meaning it is fully compatible with all standard single-stage and progressive reloading presses commonly used by Australian handloaders, including models from RCBS, Redding, Hornady, Lee, and Lyman.

Can I use this neck sizing die for brass fired in multiple different bolt-action rifles?

No, neck sizing only resizes the neck and deprimes the brass while leaving the body and shoulder dimensions fire-formed to a specific chamber. If you plan to fire your brass in multiple different rifles or semi-automatic firearms, you must use a Full Length Sizing Die such as Redding Part #91527 instead to prevent chambering issues.

What shellholder do I need to pair with the Redding 338/378 Weatherby Magnum Neck Sizing Die?

To use this die effectively, you will need a Redding #18 standard shellholder (Part #11018) or a Redding Competition Shellholder (#11618), which must be purchased separately. The die itself includes the #16336 expander button with a 0.338" expander ball.

Does this mechanical reloading die require any electrical compliance or SAA certifications for use in Australia?

No electrical compliance, SAA approvals, Australian plugs, or RCM markings are required for this product. The Redding 81527 is a purely mechanical, manually operated reloading tool with zero electronic components.

338 378 Neck Die - Redding 81527

The Redding 338/378 Wby Weatherby Magnum Neck Sizing Die (Part #81527) is a precision, single-station bottleneck reloading die manufactured from heat-treated, hardened alloy steel. Built for handloading .338-378 Weatherby Magnum brass cases, this tool resizes only the case neck and decaps spent primers while leaving the fire-formed body dimensions and shoulder angle intact. By preserving the exact custom fire-formed fit to a specific rifle's chamber, this mechanical die minimises brass work-hardening, extends the working life of cartridge cases, and maintains concentricity across repeat firings.

Key Features

Neck-Only Resizing: Sizes the case neck to deliver proper bullet tension while depriming, preventing unnecessary working of the case body and shoulder.
Preserves Fire-Formed Dimensions: Maintains the exact fire-formed geometry of your fired brass for tight-tolerance chamber alignment in bolt-action rifles.
Standard Press Integration: Built with industry-standard 7/8"-14 mounting threads to fit standard single-stage and progressive reloading presses.
Complete Decapping Assembly: Equipped with a factory decapping rod assembly (#25336) and a 0.338" expander ball (#16336).

Product Specifications

Calibre Compatibility: .338-378 Weatherby Magnum (.338" bullet diameter)
Mounting Interface: 7/8"-14 thread
Material: Heat-treated, hardened alloy steel
Expander Button: #16336 (0.338" expander ball included)
Decapping Assembly: #25336 (utilises #01025 rod and #01060 decapping pin)
Shellholder Compatibility: Redding #18 (Part #11018) or Competition Shellholder #11618 (sold separately)
Lock Ring: 7/8"-14 standard size

Who is the Redding 338/378 Wby Weatherby Magnum Neck Sizing Die for?

Extreme long-range target shooters — Preserves custom fire-formed cartridge geometry and improves concentricity by sizing only the case neck on .338-378 Weatherby Magnum brass using an integrated 0.338" expander button, ensuring consistent chamber alignment in dedicated single-rifle setups.
Big-game hunters handloading .338-378 Weatherby Magnum ammunition — Minimises brass work-hardening on large-capacity .338" diameter magnum cases across repeat firings, extending the operational life of high-volume brass through a dedicated neck sizing reloading die designed for standard 7/8"-14 threaded presses.

Less suitable for: Reloading brass intended for semi-automatic actions, lever-action rifles, or across multiple different firearms, where full-length sizing dies are required to return case shoulders and body diameters to factory SAAMI tolerances.

SKU	RD41922LP
Model #	81527
Brand	Redding
Shipping Weight	1.0000kg

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Redding 81527 Neck Sizing Die 338 378 Weatherby Magnum

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