The Redding 80275 Full Length 2 Die Set is a precision reloading tool engineered specifically for .300 Remington Short Action Ultra Magnum (.300 RSAUM / .300 Rem SAUM) cartridge cases. Machined from heat-treated alloy steel with hand-polished internal chambers, this two-die set restores fired brass to SAAMI dimensions and seats .308 in (7.62 mm) diameter projectiles. The full-length sizing die deprimes, resets neck tension, and bumps the case shoulder to ensure dependable cycling in bolt-action and semi-automatic platforms, while the seating die provides concentric bullet alignment with an integrated roll crimp ring.

Key Features

• Full-Length Resizing & Decapping: Compresses the entire case body to original factory dimensions, deprimes spent primers, and expands the case neck using a steel size button.
• Precision Bullet Seating: Seats .308 in diameter bullets straight into the case neck with a built-in roll crimp ring for secure projectile retention.
• Heat-Treated Alloy Steel: Precision-ground and internally hand-polished steel dies maintain tight dimensional tolerances and resist wear across high-volume reloading sessions.
• Standard Threading: Industry-standard 7/8"-14 threads ensure compatibility with single-stage and turret reloading presses.
• Includes Lock Rings: Comes equipped with standard Redding lock rings for secure, repeatable press depth settings.

Specifications

• Cartridge Compatibility: .300 Remington Short Action Ultra Magnum (.300 RSAUM / .300 Rem SAUM)
• Bullet Diameter: .308 in / 7.62 mm
• Die Thread Size: 7/8"-14
• Sizing Die Assembly: Full length resizing die (#91275) with decapping rod assembly (#23307), decapping rod (#01023), decapping pin (#01060), and steel expander size button (#40307)
• Seating Die Assembly: Bullet seating die (#92275) with seat plug (#01079) and roll crimp
• Required Shellholder: Redding #6 Standard Shellholder (#11006) or #6 Competition Shellholder (#11606) (sold separately)
• Power Source: Manual mechanical tool

Who is the Redding Full Length 2 Die Set For .300 Rem Short Action Ultra Mag for?

• .300 Rem SAUM Handloaders — Requires full-length resizing of fired brass to guarantee smooth chambering and consistent extraction in bolt-action and semi-automatic rifles using industry-standard 7/8"-14 threaded reloading presses.
• Hunters and Long-Range Shooters — Needs concentric seating for .308 in (7.62 mm) diameter projectiles along with an optional built-in roll crimp to build durable, accurate custom hunting and target ammunition.

Less suitable for: Handloaders processing other .30-calibre magnum cases; this die set is strictly dimensioned for .300 Rem SAUM and is not compatible with .300 Winchester Magnum, .300 WSM, or full-length .300 Remington Ultra Magnum (RUM), which require dedicated magnum-specific full length reloading die sets.