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Checking headspace is one of those jobs where guessing isn't an option, and the Forster No-Go Headspace Gage for .30-06 Springfield takes the guesswork out of it. This is the tool gunsmiths reach for when barreling a new action, inspecting a used rifle, or confirming a build is set up right before the first round goes downrange. Drop it in the chamber and try to close the bolt. If the bolt closes on the No-Go, the chamber may have excessive headspace and deserves a closer look. If it stops short, you're in good shape.
Forster offers three gage lengths per caliber: GO, NO-GO, and FIELD. The No-Go sits in the middle and represents the maximum headspace Forster recommends when chambering new bolt action rifles. It's worth knowing this isn't the absolute SAAMI-max number, which is closer to the Field dimension. Most gunsmiths set a chamber to fall between the Go and No-Go, giving you a tight, accurate, and safe fit that still runs factory ammo without a hitch. This particular gage measures 2.055 inches and covers the .30-06 Springfield along with the family of cartridges built on that case head.
These aren't rough-cut chunks of metal. Each one is made from top-quality hardened steel and precision ground to a very exacting tolerance of plus or minus .00015 inch, then inspected with NIST-certified measurement tools before it leaves the shop. That kind of consistency is why so many reloaders and smiths keep coming back to Forster regardless of the caliber they're working with. The caliber and gage type are marked right on the body, so there's no second-guessing which one you grabbed off the bench.
A quick tip from folks who use these daily: pull the extractor and ejector before you check headspace. Spring tension from those parts can give you a false reading and throw off an otherwise perfect measurement. Do it right and this little gage will tell you exactly what you need to know.
Remove the extractor and ejector from the bolt, then drop the gage into the chamber and gently try to close the bolt. If the bolt will not close on the No-Go, your headspace is within the range Forster recommends. If it does close, the chamber may have excessive headspace and should be checked further before firing.
The No-Go represents the maximum headspace Forster recommends for chambering new bolt action rifles, so it's the tighter of the two. The Field gage is longer and reflects a dimension closer to the SAAMI maximum, generally used to check older or well-used rifles for safety. Most smiths set a chamber to land between the Go and No-Go dimensions.
Yes. Because it's built on the .30-06 Springfield case head at 2.055 inches, this gage also works for other cartridges that share that same head and datum, such as .270 Winchester and .25-06 Remington. Always confirm your specific chambering shares the .30-06 headspace dimension before relying on it.
Spring pressure from the extractor and ejector can push against the gage and give you a false reading. Pulling those parts lets the bolt seat naturally against the gage so you get an accurate go or no-go answer. It's a small step that makes a real difference in the reliability of your measurement.
| UPC | 757253004643 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | HG3006N |
| Color | Steel |
| Length | 2.055'' |
| Quantity | 1 |
| Shipping Weight | 0.1 |
| Style | No Go Gauge |
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