The Redding 84138 Deluxe Reloading Die Set For 7x57 Mauser is a precision three-die kit engineered for reconditioning and assembling .284-calibre / 7x57mm Mauser bottleneck rifle cartridges. Built with industry-standard 7/8"-14 threads, this set includes a full-length sizing die with an expander decapping rod, a dedicated neck-sizing die, and a standard bullet seating die with a built-in crimping ring. Each die body is precision-machined from alloy steel on CNC lathes, heat-treated in atmospheric furnaces, and hand-polished to provide consistent chambering dimensions and reliable feeding for Australian hunting and target applications.

Key Features

• Three-Die Configuration: Includes a full-length sizing die, a neck-sizing die, and a standard bullet seating die for comprehensive brass preparation and assembly.
• Dual Sizing Flexibility: Allows full-length resizing back to factory SAAMI minimums for mixed chambers, or neck sizing only to extend brass life and maintain fire-formed alignment in bolt-action rifles.
• Precision Machined Construction: Manufactured from alloy steel, heat-treated, and hand-polished to ensure tight tolerances and smooth case extraction.
• Press Compatibility: Features standard 7/8"-14 threads to mount directly into standard single-stage, turret, or progressive reloading presses.
• Included Accessories: Supplied in a dedicated storage box that doubles as a loading block, complete with a hex wrench and a spare decapping pin.

Specifications

• Calibre: 7x57mm Mauser (7mm Mauser)
• Bullet Diameter Compatibility: 0.284 in (7mm)
• Thread Pitch: 7/8"-14 thread
• Included Dies: Full-Length Sizing Die, Neck Sizing Die, Standard Bullet Seating Die
• Material: Heat-treated alloy steel
• Required Shellholder: Redding Standard Shellholder #1 (sold separately)
• Shipping Weight: Approximately 0.5–0.9 kg

Who is the Redding 84138 Deluxe Reloading Die Set For 7x57 Mauser for?

• Handloaders loading 7x57mm Mauser ammunition for bolt-action hunting rifles — relies on the dedicated neck-sizing die to work fire-formed .284 in diameter brass, preserving fire-formed case dimensions to maximise accuracy and extend brass life across 7x57mm Mauser chambers.
• Reloaders seeking both full-length and neck-sizing options for 7mm Mauser brass — mounts to standard 7/8"-14 thread presses with a full-length sizing die to return mixed or range brass to minimum SAAMI dimensions, paired with a neck die for dedicated bolt-action cartridge assembly.

Less suitable for: Handloaders requiring micro-adjustable seating depths or bushing-based neck tension control without expander balls; a micrometer-adjustable competition seating die or bushing-style sizing die set fits precision-bench applications better.