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HORNADY 390941 CASE TRIMMER PILOT #21 .400'' (40 CAL./10MM)
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SKU: 390941-090255909418
Overview
This interchangeable pilot is made for use with the Hornady Cam Lock Trimmer when trimming cases in .400" / 40 cal./10mm applications. It is a straightforward shop accessory for reloaders who want to match the pilot size to their brass using Hornady’s sizing charts. The part is intended to support a more precise trimming setup, but it is only one component of the full trimmer system.
Why Hunters Choose the Hornady
Interchangeable Hornady
The Hornady Cam Lock Trimmer
Use Hornady
Sizing charts
Pilot Size
#21 for .400 inch, 40
Simple Replacement
Part for case trimming setup
Interchangeable Trimmer
Pilot for the Hornady Cam
Key Features
- Interchangeable trimmer pilot for the Hornady Cam Lock Trimmer
- Pilot size #21 for .400 inch applications
- Sized for 40 caliber and 10mm use
- Designed to work with Hornady sizing charts
- Accessory component for case trimming setup
Best Used For
- Reloaders using a Hornady Cam Lock Trimmer for .400-inch, 40 caliber, or 10mm cases
- Shooters who already own Hornady trimmer pilots and need a specific interchangeable size
- Handloaders matching case trimming tools to sizing charts before purchasing replacement pilots
- Users maintaining a reloading bench with Hornady-compatible case trimming accessories
Specifications
| Caliber | 40 Cal./10mm |
|---|---|
| Compatibility | Hornady Cam Lock Trimmer |
| Diameter | .400'' |
| Interchangeable | Yes |
| Model Number | 390941 |
| Pilot Number | #21 |
Pros
- Interchangeable with the Hornady Cam Lock Trimmer
- Designed for use with Hornady sizing charts
- Pilot size #21 for .400 inch, 40 caliber and 10mm cases
- Simple replacement part for case trimming setup
Considerations & Trade-offs
- Designed for use with the Hornady Cam Lock Trimmer, so it is not a standalone trimming solution.
- Pilot selection depends on matching the correct sizing chart, which adds a step before purchase and setup.
- This is a caliber-specific accessory (.400" / 40 cal./10mm), so it only fits the intended application rather than serving as a universal pilot.
- The product information provided is limited to compatibility and size, so buyers need to verify fit against their exact trimming setup before ordering.
Suggested Comparisons
- Case trimmer accessories
- Reloading case trimming tools
- Reloading bench accessories
Suggested Accessories
- Case trimmer
- Reloading calipers
- Case deburring tool
- Reloading bench block
Frequently Asked Questions
What is the Hornady 390941 Case Trimmer Pilot #21 .400" used for?
It is an interchangeable trimmer pilot for use in the Hornady Cam Lock Trimmer.
Which caliber is this trimmer pilot for?
The product title identifies it as .400" for 40 cal./10mm.
Is this a complete trimmer or just one part?
This is a trimmer pilot only, not a complete case trimmer.
Will this pilot work with any case trimmer?
The source data only states that Hornady trimmer pilots are interchangeable in the Hornady Cam Lock Trimmer. Compatibility with other trimmers is not provided.
How do I know if this is the right size for my setup?
The product description says to use Hornady sizing charts to find the sizes you need.