The EGW .40 S&W 7-Hole Cartridge Checker is a precision measurement tool that verifies whether your ammunition — factory-loaded or reloaded — meets chamber specifications before it goes downrange. Whether you're a handloader who takes quality control seriously or a shooter who wants to confirm factory ammo won't cause feeding problems, this checker catches out-of-spec rounds that could lead to jams, misfires, or malfunctions in your .40 S&W firearm.
Built from 6061 T6 aircraft-grade aluminum and finished in anodized matte black, this tool is both durable and straightforward to use. The checker employs actual Clymer reamers — the same precision cutting tools used in chamber reaming — to ensure your ammunition truly matches your gun's chamber dimensions. This approach is far more reliable than eyeballing or relying on generic assumptions about what "should" work.
The 7-hole design lets you quickly assess multiple rounds side by side, measuring both minimum case diameter and maximum overall length in a single, efficient check. For handloaders, it's an essential final verification step before boxing up a batch. For shooters using commercial ammunition, it's peace of mind that your rounds won't cause reliability issues at the range or in the field.
Key Features
- Machined from 6061 T6 aircraft-grade aluminum for durability and precision
- Uses actual Clymer reamers for chamber-accurate specifications
- Seven-hole design allows simultaneous checking of multiple cartridges
- Measures both minimum case diameter and maximum overall length
- Anodized matte black finish resists wear and corrosion
- Works with factory-loaded and hand-reloaded .40 S&W ammunition
Specifications
| Caliber | .40 S&W |
| Material | 6061 T6 aircraft-grade aluminum |
| Finish | Anodized matte black |
| Hole Configuration | 7-hole |
| Reamer Type | Clymer |
| Measurements | Minimum case diameter and maximum overall length |
Frequently Asked Questions
Will this .40 S&W cartridge checker work with both factory and reloaded ammunition?
Yes. The EGW checker is designed to verify ammunition specifications regardless of source — factory loads or your own reloads. It's equally valuable for quality control in either case.
What does a 7-hole cartridge checker allow me to do?
The seven-hole design lets you evaluate multiple rounds at once rather than one at a time, making it faster to batch-check your ammunition before shooting or storage.
How does using actual Clymer reamers improve accuracy?
Clymer reamers are the industry standard for chamber cutting and reaming. By incorporating them into this checker, EGW ensures your ammunition is measured against the same precision standard your .40 S&W chamber was created to — not a generic approximation.
What out-of-spec issues can this tool catch?
The checker measures minimum case diameter and maximum overall length, which are the primary dimensions that affect how ammunition feeds, chambers, and functions. Out-of-spec measurements in these areas can cause jams, misfires, and reliability problems.
