The Hornady 40 S&W Cartridge Gauge (380704) is a Lock-N-Load pistol case gauge that lets you quickly confirm your sized brass and loaded 40 S&W ammunition will fit correctly in a SAAMI spec chamber. This Hornady 380704 40 S&W cartridge gauge provides a fast bench check for headspace and case length on 40 S&W and compatible 10mm-based brass.
Key Features
- Manufacturer part number: 380704
- Cartridge: 40 S&W (.400 caliber)
- Product type: Lock-N-Load cartridge gauge
- Function: checks sized cases and loaded cartridges for correct fit in SAAMI chambers
- Gauge style: go/no-go style drop-in gauge
- Construction: steel body cut to SAAMI maximum and minimum dimensions
- Compatibility: works with empty sized brass and complete loaded 40 S&W rounds
- Quantity: one cartridge gauge per package
Special Features
- Drop a case or loaded round into the gauge to see if it sits within the machined reference surfaces, giving you a quick visual pass or fail on sizing and trimming.
- The internal profile mirrors a proper 40 S&W chamber, which helps you catch cases that are too long, bulged, or under-sized before they cause feeding or chambering issues.
- One-piece steel construction provides a durable reference tool that stands up to frequent use on the loading bench.
- Dedicated 40 S&W geometry gives you a cartridge-specific check instead of relying on feel when test-fitting rounds in a pistol barrel.
Practical Benefits
- The Hornady 40 S&W Cartridge Gauge (380704) helps you detect headspace and length problems at the bench so your 40 S&W ammo chambers smoothly and runs reliably.
- You can sort questionable brass and confirm that resized cases and finished rounds work with typical SAAMI chambers, reducing the need to test every batch in the firearm.
- As you dial in your sizing die and case gauge workflow, this tool gives you a consistent standard so your 40 S&W reloads feed and function the way you expect in carry, training, or match pistols.
| MANUFACTURER | HORNADY |
| CALIBER | 40 S&W |