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RCBS 20804 3-DIE SET .458 WINCHESTER MAGNUM
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SKU: 20804-076683208040
Overview
Built for handloaders working with straight-wall cartridges, this die set provides the core steps needed to prepare, expand, and seat bullets in .458 Winchester Magnum brass. The sizer die sizes the case and de-primes it, while the expander die opens the case to the proper diameter and adds the flare needed for bullet feeding. The seater die then seats the bullet and applies a roll crimp. Cases must be lubricated, and a shell holder is not included with the set.
Why Hunters Choose the Rcbs
Three-die Set
Covers sizing, expanding, and seating
Roll Crimp
Seating die supports secure bullet
Sizer Die
Sizes cases and de-primes during
Expander Die
Opens the case mouth and
Loading Straight-wall
Cartridges
Key Features
- 3-die roll crimp set for loading straight-wall cartridges
- Steel sizer die sizes the case and de-primes
- Expander die opens the case to accept the bullet
- Expander die adds case mouth flare/bell for bullet feeding
- Seater die seats the bullet and roll crimps
- Shell holder is not included with this die set
Best Used For
- Handloaders working with .458 Winchester Magnum straight-wall cartridges
- Reloaders needing a three-die set for sizing, expanding, and seating
- Users who want roll crimping included in a single die set
- Reloaders prepared to lubricate cases before sizing operations
- Shooters who already have a compatible shell holder available
Specifications
| Cartridge Compatibility | .458 Winchester Magnum |
|---|---|
| Cartridge Type | Straight-wall cartridges |
| Die Set Type | 3-Die Roll Crimp Set |
| Expander Die Function | Expands the case to the proper diameter, imparts case mouth flare/bell for bullet feeding |
| Lubrication Required | Yes |
| Seater Die Function | Seats the bullet and roll crimps |
| Shell Holder Included | No |
| Sizer Die Function | Sizes the case and de-primes |
| Sizer Die Material | Steel |
Pros
- Three-die set covers sizing, expanding, and seating in one package
- Roll crimp seating die supports secure bullet seating and crimping
- Sizer die sizes cases and de-primes during the loading process
- Expander die opens the case mouth and adds flare for bullet feeding
- Designed for loading straight-wall cartridges
- Steel sizer die included for case sizing
Considerations & Trade-offs
- Designed for straight-wall cartridges, so it is not a universal die set for other case types.
- Cases must be lubricated before sizing, which adds a required prep step to the loading process.
- A shell holder is not included, so that component must be sourced separately if you do not already have one.
- The set is specific to .458 Winchester Magnum, which limits it to that cartridge family.
Suggested Comparisons
- Straight-wall cartridge die sets
- Reloading die sets
- Shell holders for reloading
- Case lubrication accessories
Suggested Accessories
- Shell holder
- Case lubricant
- Reloading press
- Case cleaning equipment
Frequently Asked Questions
What is this RCBS die set used for?
This 3-die roll crimp set is for loading straight-wall cartridges in .458 Winchester Magnum.
What dies are included in the set?
The set includes a steel Sizer Die, an Expander Die, and a Seater Die.
Does this die set require case lubrication?
Yes. The product description notes that cases must be lubricated.
Is a shell holder included?
No. The specifications state that a shell holder is not included with this die set.
What does the seater die do?
The Seater Die seats the bullet and roll crimps.