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RCBS 20904 3-DIE SET .45-70 US GOVERNMENT
Our editorial team reviews specifications, product data, and field-use information to keep pages accurate.
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SKU: 20904-076683209047
Overview
Designed for loading straight-wall cartridges, this die set supports the reloading steps needed for .45-70 Government ammunition. It includes a sizing die that sizes the case and de-primes, an expander die that brings the case mouth to the proper diameter and adds flare for bullet feeding, and a seating die that seats the bullet and applies a roll crimp. Cases must be lubricated, and a shell holder is not included, so it is best suited to reloaders who already have the necessary setup on hand.
Why Hunters Choose the Rcbs
Three-die Set
Covers sizing, expanding, and seating
Sizer Die
Sizes cases and de-primes during
Expander Die
Prepares case diameter and adds
Seater Die
Seats bullets and applies a
Straight-wall Cartridges
Used in compatible loading setups
Key Features
- 3-die roll crimp set for loading straight-wall cartridges
- Steel sizer die sizes cases and de-primes
- Expander die opens the case to proper bullet diameter
- Expander die adds case mouth flare for bullet feeding
- Seater die seats the bullet and roll crimps
- Cases must be lubricated before use
- Shell holder is not included
Best Used For
- Handloaders loading .45-70 US Government straight-wall cartridges for hunting applications
- Reloaders who need a three-die set for sizing, expanding, seating, and roll crimping
- Users prepared to lubricate cases during the sizing step
- Shooters who already have a compatible shell holder and want a die-only set
Specifications
| Cartridge | .45-70 US Government |
|---|---|
| Case Lubrication Required | Yes |
| Compatible Cartridge Type | Straight-wall cartridges |
| Die Count | 3 |
| Die Type | Roll Crimp Set |
| Expander Die Function | Expands the case to the proper diameter to accept the bullet; imparts case mouth flare/bell for bullet feeding |
| Model Number | 20904 |
| 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 for .45-70 Government loading.
- Sizer die sizes cases and de-primes during the loading process.
- Expander die prepares case diameter and adds mouth flare or bell.
- Seater die seats bullets and applies a roll crimp.
- Designed for straight-wall cartridges used in compatible loading setups.
- Steel sizer die is included in the set.
Considerations & Trade-offs
- Cases must be lubricated before sizing, so this set adds a prep step compared with dies that do not require lubrication.
- A shell holder is not included, so that component must be sourced separately before use.
- This is a 3-die roll crimp set for straight-wall cartridges, so it is intended for that loading style rather than a broader range of cartridge types.
- The set includes sizing, expanding, and seating/crimping functions, but it does not include additional accessories beyond the dies themselves.
Suggested Comparisons
- Straight-wall cartridge die sets
- Reloading die sets for rifle cartridges
- Case lubrication accessories
- Shell holders for reloading presses
Suggested Accessories
- Reloading press
- Case lubricant
- Shell holder
- Calipers
Frequently Asked Questions
What is included in the RCBS 20904 3-Die Set for .45-70 US Government?
It includes a 3-die roll crimp set: a Sizer Die, an Expander Die, and a Seater Die. The product data also notes that a shell holder is not included.
What type of cartridges is this die set designed for?
It is for loading straight-wall cartridges, and the title identifies it as a .45-70 US Government die set.
Does the sizing die require case lubrication?
Yes. The product description states that cases must be lubricated when using the steel Sizer Die.
What does the Expander Die do?
The Expander Die expands the case to the proper diameter to accept the bullet, and it also imparts case mouth flare/bell for bullet feeding.
Does this set seat and crimp bullets?
Yes. The Seater Die seats the bullet and roll crimps.