L.E. Wilson 300 Remington Ultra Magnum Case Gage
$38.72
The L.E. Wilson 300 Remington Ultra Magnum case gage is an essential tool for reloaders who want to avoid one of the most common handloading mistakes: overworking fired brass. This one-piece gage lets you quickly verify overall length and confirm proper headspace dimensions—two critical measurements that protect your brass and ensure safe, consistent ammunition. Whether you're optimizing die setup or monitoring case life across multiple reloading sessions, this gage delivers the accuracy needed to prevent premature case failure.
Built for 300 RUM reloaders, the L.E. Wilson case gage works alongside a caliper to give you fast feedback on whether your cases need trimming or if your full-length resizing die is dialed in correctly. The gage checks datum-to-head length, the measurement that matters most for headspace control. Many reloaders don't realize that oversizing brass—even slightly—accelerates neck cracking and shoulder deformation. This tool makes it easy to stay within safe limits and extend case life by several reloads.
The gage's one-piece design and middle knurling make it comfortable to handle on the bench. With clear, simple setup using the included instructions, you can integrate headspace verification into your routine without slowing down your workflow. Whether you're a precision rifle competitor fine-tuning loads or a hunter who wants dependable ammunition, this L.E. Wilson gage is the kind of straightforward, hardworking tool that separates disciplined reloading from guesswork.
Key Features
- One-piece design checks overall length and datum-to-head measurements
- Prevents brass oversizing and extends case life
- Works with standard calipers for quick headspace verification
- Helps set up 7/8"-14 press-type full-length resizing dies correctly
- Knurled middle section for secure handling
- Includes instructions
Specifications
| Product | L.E. Wilson 300 RUM Case Gage |
| Overall Length | 2.494" |
| Large End ID | .473" |
| Small End ID | .347" |
| Outer Diameter | .991" |
| Finish | Silver with knurled middle |
| Includes | Gage and instructions |
Frequently Asked Questions
What is a case gage used for in reloading?
A case gage measures the critical dimensions of fired brass—overall length and headspace (datum-to-head)—to verify that your resizing dies are set correctly and that you're not oversizing cases. Oversized brass fails faster, so regular gage checks protect your investment and improve safety.
How do I use the L.E. Wilson 300 RUM case gage?
Insert a fired case into the gage and measure the protruding portion with a caliper. Compare your measurement to the data in the included instructions to determine if trimming is needed or if your die needs adjustment. This tells you whether your full-length resizing setup is correct.
Can this gage help me set up my resizing die?
Yes. The gage is designed to help set up 7/8"-14 press-type full-length resizing dies. By checking headspace and overall length before and after sizing, you can dial in your die to the correct position and avoid the common mistake of oversizing your brass.
Is this gage compatible with belted magnum cartridges like 300 RUM?
This is a regular-style case gage. L.E. Wilson also makes adjustable-style gages specifically for belted magnum cartridges, which allow you to control shoulder resizing independently of belt support to maximize case life. Check compatibility with your specific setup.
