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L.E. Wilson
The L.E. Wilson Case Gage for 300 Norma Mag is a precision single-piece headspace and length checking tool built for reloaders who demand accuracy in their brass preparation. Whether you're setting up a full-length resizing die or verifying fired case dimensions before reloading, this gage lets you catch the most common reloading mistake—oversizing brass—before it degrades case life or creates safety issues. It's an essential checkpoint in any methodical reload process, especially for a magnum cartridge where headspace control directly affects case longevity and performance.
Used alongside a caliper, the Wilson gage gives you quick, repeatable measurements of both overall length (to flag cases needing trim) and datum-to-head length (to ensure proper headspace and prevent the shoulder compression that wears out brass fast). For serious handloaders who trust their ammunition, this tool pays for itself the first time it saves a batch of brass or prevents a resize error from ruining a firing session.
The gage is straightforward to use: simply insert the fired case into the appropriately sized end of the tool, measure with your caliper, and compare to your specifications. The knurled middle grip makes handling intuitive, and the compact design fits easily in a reloading bench setup. Each gage ships with clear instructions, so you'll know exactly how to set your dies and monitor your brass condition from shot to shot.
| Overall Length | 2.494" |
| Large End ID | .473" |
| Small End ID | .347" |
| Outer Diameter | .991" |
| Finish | Silver with knurled grip |
| Includes | Gage and instructions |
Insert a fired case into the appropriate end of the gage, then use a caliper to measure the overall length and the datum-to-head distance. Record these measurements, then adjust your full-length resizing die to bring resized cases into the proper range. This prevents the oversize shoulder compression that degrades brass.
Measuring a fired case shows you the maximum dimensions your brass will reach. Once you resize, you measure again to confirm your die is compressing the shoulder correctly—not too much (which wears out the case quickly) and not too little (which can cause headspace issues). The gage helps you find that ideal middle ground.
Yes. Use either a dial or digital caliper to measure the distances shown by the gage. The tool itself provides the reference dimensions; your caliper provides the precise readout.
This L.E. Wilson gage is designed for 300 Norma Mag. The bore and shoulder dimensions are matched to that cartridge, so it won't work for other calibers.
L.E. Wilson
The L.E. Wilson Case Gage for 300 Norma Mag is a precision single-piece headspace and length checking tool built for reloaders who demand accuracy in their brass preparation. Whether you're setting up a full-length resizing die or verifying fired case dimensions before reloading, this gage lets you catch the most common reloading mistake—oversizing brass—before it degrades case life or creates safety issues. It's an essential checkpoint in any methodical reload process, especially for a magnum cartridge where headspace control directly affects case longevity and performance.
Used alongside a caliper, the Wilson gage gives you quick, repeatable measurements of both overall length (to flag cases needing trim) and datum-to-head length (to ensure proper headspace and prevent the shoulder compression that wears out brass fast). For serious handloaders who trust their ammunition, this tool pays for itself the first time it saves a batch of brass or prevents a resize error from ruining a firing session.
The gage is straightforward to use: simply insert the fired case into the appropriately sized end of the tool, measure with your caliper, and compare to your specifications. The knurled middle grip makes handling intuitive, and the compact design fits easily in a reloading bench setup. Each gage ships with clear instructions, so you'll know exactly how to set your dies and monitor your brass condition from shot to shot.
| Overall Length | 2.494" |
| Large End ID | .473" |
| Small End ID | .347" |
| Outer Diameter | .991" |
| Finish | Silver with knurled grip |
| Includes | Gage and instructions |
Insert a fired case into the appropriate end of the gage, then use a caliper to measure the overall length and the datum-to-head distance. Record these measurements, then adjust your full-length resizing die to bring resized cases into the proper range. This prevents the oversize shoulder compression that degrades brass.
Measuring a fired case shows you the maximum dimensions your brass will reach. Once you resize, you measure again to confirm your die is compressing the shoulder correctly—not too much (which wears out the case quickly) and not too little (which can cause headspace issues). The gage helps you find that ideal middle ground.
Yes. Use either a dial or digital caliper to measure the distances shown by the gage. The tool itself provides the reference dimensions; your caliper provides the precise readout.
This L.E. Wilson gage is designed for 300 Norma Mag. The bore and shoulder dimensions are matched to that cartridge, so it won't work for other calibers.
