Description
If you're loading your own 25-06 Remington, this little steel cylinder is one of those tools you wonder how you ever got by without. Drop a fired case in and it tells you two things that matter most for safe, consistent ammo: where your shoulder sits for headspace and whether your brass has stretched past max trim length. No calipers gymnastics required for a quick check, just drop and look across the steps.
What the 25-06 Remington Case Gage Does on the Bench
This is a one-piece, non-adjustable gage machined from steel and cut to the minimum and maximum SAAMI dimensions for the 25-06. You use it with fired brass to get a real baseline before you ever touch your sizing die. Measure a case in its as-fired state and note the headspace reading, resize it, then drop it back in to see exactly how far you're setting the shoulder back. That feedback loop is how you stop oversizing, which is the main culprit behind case head separation and short brass life. A good target most reloaders chase is bumping the shoulder back somewhere around .001 to .002, and this gage shows you when you've hit it.
Checking Trim Length With the CG-2506
Once your brass is sized, flip the routine around. Set the case head on a flat surface, slide the gage down over it, and sight across the top steps. If the case mouth clips the max step, it's time to trim. Sit between the steps and you're good to load. It's a fast go/no-go read that keeps your overall case length honest and your chambering smooth.
A Design With Real History
L.E. Wilson has been a family-run shop since 1927, and they were the first to bring the Cartridge Case Gage to reloaders back in 1935 after founder Sam Wilson helped a fellow shooter track down a case-separation problem. That's nearly a century of the same simple, dependable idea. One note worth knowing: this gage does not measure body diameters, so pair it with a set of calipers for a complete picture on the bench.
Key Specifications
- Manufacturer: L.E. Wilson
- Manufacturer Part Number: CG-2506
- UPC: 857949005470
- Cartridge: .25-06 Remington
- Tool Type: Case Length & Headspace Gage
- Design: One-piece, non-adjustable cylinder type
- Material: Polished Steel
- Measures: Min/max headspace and min/max case length
- Firearm Type: Rifle
- Country of Origin: United States
What’s Included
- L.E. Wilson 25-06 Remington Case Gage (CG-2506)
Frequently Asked Questions
What does the L.E. Wilson 25-06 Remington Case Gage actually measure?
It checks two things on your fired and resized 25-06 brass: headspace, which is the datum-to-head length that tells you how far your shoulder is set back, and overall case length so you know when to trim. You read both by comparing where the case sits against the minimum and maximum steps machined into the gage. It does not measure case body diameters, so keep a set of calipers handy for that.
Do I need a depth micrometer to use the CG-2506?
For a basic go/no-go check you can just drop the case in and eyeball where it sits relative to the steps. If you want precise numbers on exactly how much shoulder setback you're getting, a case gage depth micrometer or a caliper makes it much easier. Plenty of folks run this gage with nothing more than calipers and get great results.
Can I use this gage with unfired or factory brass?
It's designed to be used with fired cases to give you a true baseline for your rifle's chamber before you set up your sizing die. Checking as-fired brass first is important because no two chambers have identical headspace. After sizing, you drop the cases back in to verify shoulder setback and case length.
Is the 25-06 Remington Case Gage adjustable?
No, it's a one-piece, non-adjustable steel gage cut to SAAMI minimum and maximum dimensions for the 25-06 Remington. There are no moving parts to wear out, loosen up, or fall out of calibration, which is a big part of why these have been trusted on reloading benches for decades.




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