The Redding .300 Remington Short Action Ultra Magnum (.300 SAUM) Full Length Die Set is a two-die reloading system engineered to restore fired bottleneck cases back to SAAMI factory dimensions and precisely seat projectiles. Machined from heat-treated alloy steel on precision CNC lathes, hand-polished, and ultrasonically cleaned, this set prepares brass for reliable chambering and consistent extraction in short-action magnum rifles. It operates mechanically on standard reloading presses and includes a full-length sizing die and a bullet seating die with an integrated crimping ring.

• Full-Length Sizing Die: Resets case body dimensions, sets shoulder headspace back to factory specification, decaps spent primers, and expands the case neck to uniform tension in a single press stroke.
• Bullet Seating Die: Features an internal bullet guide for concentric projectile alignment during seating, with a built-in roll crimp ring for securing bullets with a cannelure.
• Durable Alloy Steel Construction: Heat-treated and finished to maintain dimensional accuracy under repetitive sizing pressures without galling.
• Standard Thread Mounting: Fitted with industry-standard 7/8"-14 TPI threads for complete compatibility with standard single-stage and turret reloading presses.
• Included Storage and Spares: Supplied in a plastic storage box that doubles as a cartridge loading block, complete with a spare decapping pin and hex wrench.

Specifications

• Cartridge Compatibility: .300 Remington Short Action Ultra Magnum (.300 SAUM)
• Bullet Diameter Compatibility: .308 in (7.62 mm)
• Thread Interface: 7/8"-14 TPI
• Die Set Type: 2-Die Set (Full-Length Resizing Die, Bullet Seating Die)
• Required Shellholder: Redding Shellholder #6 (sold separately)
• Material: Heat-treated alloy steel
• Operation: Manual / mechanical
• Shipping Weight: Approx. 0.55 kg to 0.65 kg (1.2 lbs to 1.4 lbs)

Who is the Redding 300 SAUM Full Length Die Set for?

• Long-range precision shooters using short-action magnum platforms — Requires this full length reloading die set to size .308 in bullet diameter cases back to SAAMI minimum headspace on standard 7/8"-14 TPI press threading, ensuring uniform neck tension and smooth cycling in tight-tolerance bolt-action rifles.
• Deer and game hunters reloading .300 SAUM ammunition — Relies on this full length reloading die set paired with a Redding Shellholder #6 to restore fired brass to factory dimensions, preventing feed jams and ensuring field-ready reliability across repeated hunting cycles.

Less suitable for: Reloaders working with standard .300 Winchester Magnum, .300 WSM, or full-length .300 RUM cartridges, which have different shoulder angles, case tapers, and lengths; these require dedicated full-length die sets specific to those individual magnum case geometries.