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RCBS 12501 F L DIE SET .257 ROBERTS
Our editorial team reviews specifications, product data, and field-use information to keep pages accurate.
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SKU: 12501-076683125019
Overview
This two-die set is built for reloading bottleneck cases, giving handloaders the core tools needed to size and seat cartridges in a controlled, repeatable way. The full-length sizer die returns cases to SAAMI minimum cartridge dimensions, de-primes them, and expands the neck for bullet seating, while vents help reduce the risk of case damage from trapped air or excess lubricant. The seater die includes a bullet seater plug and a built-in roll crimper, allowing the bullet to be seated and secured in one step. It uses standard 7/8-inch-14 threads, and a shell holder is not included.
Why Hunters Choose the Rcbs
Two-die Set
Covers full-length sizing and bullet
Full-length Sizer
Brings cases to SAAMI minimum
Sizer Die
Includes expander-decapping unit for resizing
Built-in Vents
Help reduce case damage from
Seater Die
Includes a built-in roll crimper
Key Features
- Two-die set for reloading bottleneck cases
- Includes a Full-Length Sizer Die with Expander-Decapping Unit
- Includes a Seater Die with Bullet Seater Plug
- Sizer die brings cases to SAAMI minimum cartridge dimensions
- Built-in roll crimper secures the bullet during seating
- Standard 7/8-inch-14 thread; shell holder not included
Best Used For
- Reloaders working with .257 Roberts bottleneck cases and standard 7/8-inch-14 presses
- Users needing full-length sizing to SAAMI minimum cartridge dimensions
- Handloaders who want seating and roll crimping in one step
- Reloaders seeking a two-die setup for de-priming and neck expansion
- Shooters who already have a shell holder and need a die-only set
Specifications
| Case Body Length Change | Avoids changing the case body length during full length sizing |
|---|---|
| Die Type | Two-die set |
| Full Length Sizer Die Function | Brings the case to SAAMI minimum cartridge dimensions |
| Headspace Control | Held to minimum tolerances |
| Intended Use | Reloading bottleneck cases |
| Roll Crimper | Built-in roll crimper |
| Seater Die | Seater Die with Bullet Seater Plug |
| Shell Holder Included | No |
| Sizer Die | Full-Length Sizer Die with Expander-Decapping Unit |
| Sizer Die Operations | Sizes the outside of the case, de-primes, and expands the neck to accept the bullet |
| Thread Size | Standard 7/8-inch-14 thread |
| Vents | Yes |
Pros
- Two-die set covers full-length sizing and bullet seating for bottleneck cases.
- Full-length sizer brings cases to SAAMI minimum cartridge dimensions.
- Sizer die includes expander-decapping unit for resizing and primer removal.
- Built-in vents help reduce case damage from trapped air or excess lubricant.
- Seater die includes a built-in roll crimper for bullet retention.
- Standard 7/8-inch-14 thread fits common reloading setups.
Considerations & Trade-offs
- Designed for bottleneck cases, so it is not a universal die set for every cartridge type.
- A shell holder is not included, so that component must be sourced separately before use.
- The full-length sizing die brings cases to SAAMI minimum cartridge dimensions, which may be more sizing than some reloaders want for a specific rifle setup.
- The seater die includes a built-in roll crimper, which is useful for securing bullets but may not suit every loading preference.
Suggested Comparisons
- Reloading die sets
- Bottleneck rifle case reloading dies
- Full-length sizing dies
- Bullet seating and crimping dies
Suggested Accessories
- Full-length sizing die set
- Bullet seating die
- Reloading shell holder
- Case lubricant
Frequently Asked Questions
What comes in the RCBS 12501 F L Die Set for .257 Roberts?
This two-die set includes a Full-Length Sizer Die with an Expander-Decapping Unit and a Seater Die with a Bullet Seater Plug.
Is this die set meant for bottleneck cases?
Yes. The product description says it is intended for reloading bottleneck cases.
Does this set include a shell holder?
No. The specifications state that a shell holder is not included with this die set.
What thread size does this die set use?
It uses standard 7/8-inch-14 thread.
Does the seater die crimp the bullet?
Yes. The included Seater Die has a built-in roll crimper to secure the bullet at the same time it is seated.