The L.E. Wilson 50 BMG case gage is an essential tool for any serious .50 BMG reloader who wants to dial in accurate headspace and prevent costly brass damage. This single-piece gage lets you quickly verify overall length and measure datum-to-head dimensions, giving you the data you need to set up your 7/8"-14 press-type full-length resizing dies correctly. Oversizing brass is one of the most common—and expensive—reloading mistakes; this tool removes the guesswork by giving you precise headspace confirmation before you fire.
Simply place your fired cases in the gage, use a caliper to measure the relevant dimensions, and you'll know instantly whether your cases need trimming or if your die setup is creating excessive headspace. For .50 BMG—where cases are costly and durable brass is hard to come by—catching headspace issues before they shorten case life pays for itself in the first dozen reloads. The tool itself is straightforward: a one-piece design with a large bore end (.473" ID) and smaller shoulder end (.347" ID), finished in silver with a knurled grip section for reliable handling at the bench.
If you're running belted magnum cartridges or working with expensive precision brass, controlling headspace is non-negotiable. This gage gives you the confidence that your resizing is holding brass within safe tolerances, extending case life and maintaining the accuracy your .50 BMG platform deserves.
Key Features
- One-piece design for checking overall length and datum-to-head dimensions
- Prevents brass oversizing by enabling precise headspace verification
- Dual-diameter bore for proper case seating and measurement
- Knurled grip section for secure bench handling
- Works with standard calipers for quick, accurate readings
Specifications
| Overall Length | 2.494" |
| Large End ID | .473" |
| Small End ID | .347" |
| Outside Diameter | .991" |
| Finish | Silver with knurled grip |
| Contents | Gage and instructions |
Frequently Asked Questions
What press dies does this gage work with?
The L.E. Wilson 50 BMG case gage is designed to set up 7/8"-14 press-type full-length resizing dies, the standard for .50 BMG reloading.
How do I use a case gage to check headspace?
Place your fired case into the gage, allowing it to seat fully. Use a standard caliper to measure the datum-to-head distance. Compare your measurement to your cartridge's specification. Repeat for several cases to verify your resizing die is holding cases within safe headspace tolerances.
Can I use this gage for belted magnum cartridges?
This is a fixed-style gage designed for .50 BMG. L.E. Wilson also manufactures adjustable-style gages for belted magnums, which allow the belt to provide proper headspace support while minimizing shoulder resizing to extend case life. Check the product specifications to confirm the exact cartridge compatibility.
What's included in the package?
The gage comes with complete instructions in a cardboard box. You'll need to supply your own caliper for measurement.
