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RCBS 16801 F L DIE SET .338-378 WEATHERBY MAGNUM
Our editorial team reviews specifications, product data, and field-use information to keep pages accurate.
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SKU: 16801-076683168016
Overview
This two-die set is built for reloading bottleneck cases when consistent full-length sizing and bullet seating are the goal. The full-length sizer die brings cases to SAAMI minimum cartridge dimensions, de-primes them, and expands the neck, 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 the same 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
Die brings cases to SAAMI
Sizer Die
De-primes and expands the neck
Vents Help
Reduce case damage from trapped
Headspace Is
Held to minimum tolerances during
Key Features
- Two-die set for reloading bottleneck cases in .338-378 Weatherby Magnum.
- Includes a full-length sizer die with expander-decapping unit.
- Sizer die brings cases to SAAMI minimum cartridge dimensions.
- Sizer die vents help prevent case damage from trapped air or excess lubricant.
- Seater die includes a bullet seater plug and built-in roll crimper.
- Standard 7/8-inch-14 thread; shell holder not included.
Best Used For
- Reloaders working with .338-378 Weatherby Magnum bottleneck cases
- Shooters needing full-length sizing to SAAMI minimum cartridge dimensions
- Handloaders who want seating and roll crimping in one die set
- Users already equipped with a compatible shell holder for 7/8-inch-14 dies
Specifications
| Cartridge | .338-378 Weatherby Magnum |
|---|---|
| Case Body Length Change During Full Length Sizing | Minimized |
| Die Set Type | Two-die set |
| Die Vents | Yes |
| Headspace Control | Held to minimum tolerances |
| Included Dies | Full-Length Sizer Die with Expander-Decapping Unit; Seater Die with Bullet Seater Plug |
| Intended Use | Reloading bottleneck cases |
| Seater Die Feature | Built-in roll crimper |
| Shell Holder Included | No |
| Sizer Die Function | Brings the case to SAAMI minimum cartridge dimensions |
| Sizer Die Operations | Sizes the outside of the case; de-primes; expands the neck to accept the bullet |
| Thread Size | Standard 7/8-inch-14 |
Pros
- Two-die set covers full-length sizing and bullet seating for bottleneck cases.
- Full-Length Sizer Die brings cases to SAAMI minimum cartridge dimensions.
- Sizer die de-primes and expands the neck to accept the bullet.
- Vents help reduce case damage from trapped air and excess lubricant.
- Headspace is held to minimum tolerances during full-length sizing.
- Seater Die includes a built-in roll crimper for bullet retention.
Considerations & Trade-offs
- Designed for bottleneck cases, so it is not a general-purpose die set for every cartridge type.
- A shell holder is not included, so that component must be sourced separately if needed.
- The full-length sizing die brings cases to SAAMI minimum cartridge dimensions, which may be less suitable if you are trying to preserve a more customized chamber fit.
- The seater die includes a built-in roll crimper, which is useful for securing bullets during seating but adds a crimping step whether you want it or not.
Suggested Comparisons
- Reloading die sets
- Full-length sizing dies
- Bullet seating dies
- Bottleneck rifle cartridge reloading tools
Suggested Accessories
- Reloading press
- Shell holder
- Case lubricant
- Case cleaning equipment
Frequently Asked Questions
What comes in the RCBS 16801 F L Die Set for .338-378 Weatherby Magnum?
It includes a Full-Length Sizer Die with an Expander-Decapping Unit and a Seater Die with a Bullet Seater Plug. A shell holder is not included.
What type of cases is this die set intended for?
It is intended for reloading bottleneck cases.
What does the Full-Length Sizer Die do?
According to the product description, it sizes the outside of the case, de-primes it, expands the neck to accept the bullet, and brings the case to SAAMI minimum cartridge dimensions.
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.
What press thread size does this die set use?
The specifications list a standard 7/8-inch-14 thread.