The Redding Deluxe 3-Die Set for .257 Weatherby Magnum (Model 84226) is a precision handloading toolset engineered from heat-treated alloy steel with hand-polished internal chambers. Built to industry-standard 7/8"-14 TPI threading, this Series B rifle die set provides dual-sizing flexibility for reloading .257-inch bullet diameter ammunition. It includes a full-length sizing die with a decapping rod assembly, a dedicated neck sizing die, a standard bullet seating die, and 7/8"-14 lock rings in a moulded storage box.

• Dual Sizing Functionality: Contains both a full-length sizing die to restore brass to SAAMI factory specifications and a neck sizing die to preserve fire-formed case dimensions.
• Extended Case Life: Neck sizing only works the case neck, reducing brass work-hardening and maintaining concentricity for bolt-action rifles.
• Universal Press Fit: Standard 7/8"-14 TPI thread interface ensures compatibility with standard single-stage and turret reloading presses.
• Heat-Treated Steel Construction: Machined from precision alloy steel with hand-polished internal surfaces to minimise friction during sizing.

Specifications

• Cartridge Calibre: .257 Weatherby Magnum
• Bullet Diameter: 0.257 in
• Thread Pitch: 7/8"-14 TPI
• Die Set Series: Redding Series B
• Included Dies: Full-Length Sizing Die (Part #91226), Neck Sizing Die (Part #81226), Standard Bullet Seating Die
• Shellholder Compatibility: Redding #6 standard shellholder or #6 Competition Shellholder (sold separately)
• Operation Type: Mechanical reloading press mounted

Who is the Redding Deluxe Reloading Die Set for .257 Weatherby Magnum for?

• Precision Bolt-Action Handloaders — who require extended brass life and chamber concentricity, utilizing the dedicated neck sizing die to size only the neck for 0.257 in bullets without overworking fire-formed .257 Weatherby Magnum brass cases.
• Field and Big-Game Hunters — requiring flawless feeding and chambering reliability across diverse conditions by using the full-length resizing die with standard 7/8"-14 TPI press threading to return high-pressure .257 Weatherby Magnum cartridges to exact factory SAAMI dimensions.

Less suitable for: Handloaders sizing alternative .25-calibre cartridges such as the .25-06 Remington or .257 Roberts, which require calibre-specific die sets machined to their distinct shoulder angles and case lengths, or shooters loading brass for multiple different firearms or non-bolt actions using only the neck sizing die, who instead require dedicated full-length resizing dies or small-base sizing dies.