Will the Redding 77874 Type S Full Length Die work with other 338 calibres like the 338 Winchester Magnum or 338 Lapua Magnum?

No. This die is strictly engineered for the 338 Remington Ultra Magnum cartridge case and is completely incompatible with 338 Winchester Magnum, 338 Lapua Magnum, or 338 Norma Magnum due to distinct case dimensions, tapers, and shoulder angles.

What press threading and shellholders are required to set up the Redding 338 RUM Type S Die on my reloading bench?

This die features an industry-standard 7/8"-14 thread, making it compatible with standard single-stage and turret presses commonly used in Australia such as the RCBS Rock Chucker or Redding Big Boss. You will also need to separately acquire a Redding #6 shellholder (MPN 11006) or a Redding Competition Shellholder #6 (MPN 11606).

Are sizing bushings included with the Redding 77874 die, and how do I select the right size?

Sizing bushings are not included with this die and must be purchased separately to match your specific brass neck-wall thickness. For instance, you can pair it with heat-treated steel options like the Redding 73333 neck sizing bushing if it matches your loaded cartridge dimensions, allowing you to precisely control neck tension in .001" increments.

338 RUM Reloading Die - Redding 77874

The Redding Type S – Bushing Full Length Die (.338 Remington Ultra Magnum) restores fired cartridge brass to factory dimensions while providing precise neck tension management. Designed with an industry-standard 7/8"-14 thread, this die resizes the entire case body and bumps the shoulder back to SAAMI specifications in a single press stroke. By utilising interchangeable, self-centring sizing bushings (sold separately in .001" increments), it allows handloaders to control neck sizing without overworking the brass or inducing runout.

Full-Length Resizing: Sizes the full body and bumps the shoulder of .338 Remington Ultra Magnum brass to maintain reliable chambering and cycling.
Self-Centring Floating Bushing: Holds the sizing bushing in a floating cap assembly to align naturally with the cartridge neck axis, maximising concentricity.
Configurable Expander System: Comes equipped with a steel size button and decapping rod assembly, with the flexibility to remove the expander button entirely or upgrade to an optional carbide expander button.
Adjustable Sizing Depth: Allows the user to adjust the decapping rod to size the entire length of the case neck or only a partial section.
Standard Press Mounting: Features standard 7/8"-14 threading to fit single-stage and turret reloading presses with adequate stroke clearance for magnum cases.

Specifications

Calibre: .338 Remington Ultra Magnum (.338 RUM)
Compatible Bullet Diameter: 0.338"
Die Thread: 7/8"-14
Required Shellholder: Redding #6 Shellholder (sold separately)
Unit Weight: Approximately 0.45 kg
Included Components: Full-length die body, decapping rod assembly (MPN 23338), size button (MPN 16336), decapping pin (MPN 01060), lock ring (MPN 01016)

Who is the Redding 338 Rum Remington Ultra Magnum Type S - Full Length Die for?

Long-range precision handloaders — requires exact neck tension control via interchangeable bushings while full-length sizing large-capacity .338 Remington Ultra Magnum cartridge cases to minimise brass fatigue across repeated firings.
Hunters and competitive shooters — relies on standard 7/8"-14 thread press compatibility and full-length body resizing to ensure consistent chamber feeding in .338 RUM bolt-action rifles without sacrificing concentricity.

Less suitable for: Handloaders loading other .338-calibre cartridges such as .338 Lapua Magnum, .338 Winchester Magnum, or .338 Norma Magnum; distinct shoulder angles, case tapers, and body dimensions require a dedicated cartridge-specific bushing full-length die.

SKU	RD41848LP
Model #	77874
Brand	Redding
Shipping Weight	1.0000kg

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Redding 77874 Type S Bushing Full Length Die 338 Rum

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