What reloading press thread size and shellholder do I need to use with the Redding 81252 300 Wby Magnum neck sizing die?

This die features an industry-standard 7/8"-14 thread, making it universally compatible with standard single-stage and turret presses commonly used in Australian reloading benches. For proper case retention during the operation, you will need to pair it with a Redding Shellholder #6, which is sold separately.

Can I use brass sized with this neck sizing die in multiple different .300 Weatherby Magnum rifles?

No, neck-sized brass is fire-formed specifically to the chamber of the individual rifle it was previously fired in and must not be shared across different rifles of the same calibre. For reliable chambering, ammunition reloaded with this die should only be cycled through the exact same bolt-action rifle.

How often will I need to use a full-length sizing or body die when reloading with the Redding 81252?

While this neck sizing die extends brass life by only working the neck portion, brass cases will eventually expand after 3 to 5 reload cycles depending on your loads. Once bolt closure encounters resistance, you will need to process the cases through a full-length sizing die or a body die to bump the shoulder back.

Are there any electrical compliance requirements or Australian certifications needed for this reloading die?

No, as a purely mechanical, manually operated workshop tool, electrical compliance ratings like 240V plugs and SAA or RCM regulatory approvals are completely non-applicable to this product.

300 Weatherby Die - Redding 81252

The Redding 300 Weatherby Magnum Neck Sizing Die (MPN: 81252) is a precision reloading tool engineered to resize only the neck of bottleneck cartridge brass while leaving the fire-formed body and shoulder untouched. Machined from heat-treated alloy steel, this die prevents premature work-hardening of the brass case, extending its service life and maintaining precise alignment with the rifle's native chamber. It is equipped with internal decapping rod assembly #25307, featuring decapping rod #01025, decapping pin #01060, and steel expander button #40307 to deprime spent primers and set internal neck tension in a single manual press stroke.

Key Features

Dedicated Neck Sizing: Resizes only the neck of .300 Weatherby Magnum cases, preserving fire-formed case body and shoulder dimensions to maximize chamber concentricity.
Extended Case Life: Eliminates excessive full-body brass working, reducing case stretching and work-hardening over repeated firings.
Integrated Decapping Assembly: Deprimes spent primers and expands the inside neck diameter to correct tension simultaneously via the internal steel size button.
Standard Thread Mounting: Features the universal 7/8"-14 reloading press thread pattern for compatibility with standard single-stage and turret presses.

Specifications

Calibre Compatibility: .300 Weatherby Magnum (.308 in / 7.82 mm bullet diameter)
Press Thread Pattern: 7/8"-14 standard thread
Shellholder Compatibility: Redding Shellholder #6 (sold separately)
Material: Heat-treated alloy steel
Internal Assembly: Decapping rod assembly #25307 with decapping pin #01060 and steel expander #40307
Packaged Weight: Approximately 250–350 g
Operation: Non-powered manual reloading tool

Who is the Redding 300 Weatherby Magnum Neck Sizing Die for?

Precision target shooters: who require maximum benchrest concentricity by using this steel neck sizing die to preserve fire-formed chamber alignment across .300 Weatherby Magnum (.308 in / 7.82 mm bullet diameter) brass without working the case body.
Dedicated big-game hunters: who reuse .300 Weatherby Magnum cases across standard 7/8"-14 thread presses, maintaining dedicated fire-formed brass exclusively for a single bolt-action hunting rifle to extend cartridge case longevity.

Less suitable for: semi-automatic, pump-action, lever-action, or break-action rifles requiring full-length sizing for reliable feeding, as well as cases that have undergone 3 to 5 reload cycles where body expansion causes bolt closure resistance; these scenarios require a full-length sizing die or dedicated body die to set the shoulder back.

SKU	RD102865LP
Model #	81252
Brand	Redding
Shipping Weight	0.2000kg

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Redding 81252 Neck Sizing Die 300 Weatherby Magnum Steel

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