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The Forster Belted Magnum No-Go Headspace Gauge is the tool you reach for when you want to know your belted magnum chamber isn't running long. It references the belt on the case, which is where belted magnums headspace, and gives you a hard checkpoint that a properly cut chamber should not close on. Forster machines these from A2 tool steel and grinds them to within about .00015 inches, so the number you're checking against is one you can trust.
Headspace is the gap between the breech face and the point where the case seats when the action is closed, and letting it run too long is both an accuracy killer and a safety concern. If your bolt closes on the Go gauge but stops on this No-Go, you're sitting in the sweet spot most gunsmiths chamber to. If it closes on the No-Go, that means your headspace is longer than this gauge allows, which is worth a closer look with a Field gauge before you keep shooting.
The great thing about the belted magnum design is that the belt dimension is shared across the family, so this single BG300MN covers a huge spread of cartridges. That includes 257 Weatherby, 264 Winchester, 6.5 Remington Magnum, 270 Weatherby, 7mm Remington Magnum, 300 H&H, 300 Winchester Magnum, 300 Weatherby, 338 Winchester Magnum, 340 Weatherby, 375 H&H, 416 Remington, and 458 Winchester, among others sharing the .535 belt diameter. One tool on the bench handles most of the magnum work that walks through the door.
This is a gunsmith and reloader tool at heart. It's what you use when finish chambering a new barrel or double-checking a used rifle before it goes back into rotation. Pair it with a Go gauge to bracket your chamber cut, and you've got a simple, repeatable way to set tight, accurate headspace on your belted magnum builds.
It fits standard belted magnums that share the .535 belt diameter, which is a long list. That covers 257 Weatherby, 264 Winchester, 6.5 Remington Magnum, 270 Weatherby, 7mm Remington Magnum, 300 H&H, 300 Winchester Magnum, 300 Weatherby, 338 Winchester Magnum, 340 Weatherby, 375 H&H, 416 Remington, and 458 Winchester, among others. Since belted mags headspace on the belt, one gauge handles the whole family.
It means your headspace is longer than the No-Go dimension, which sits at the upper end of what most gunsmiths chamber to. This isn't automatically a max reading, since a chamber can close on a No-Go and still be inside broader industry limits. The next step is checking with a Field gauge to see if the chamber is truly running long.
For setting up a new barrel, you'll want both. The Go gauge confirms the chamber will accept properly sized ammo, and the No-Go confirms it isn't cut too long. Chambering somewhere between the two gets you tight, accurate, and dependable headspace.
Forster machines these from A2 tool steel and grinds them to a tolerance of about .00015 inches. That level of precision is what makes the reading trustworthy when you're checking a chamber. The gauge is dimensioned to SAAMI standards so it matches the specs your chamber was cut to.
| UPC | 757253002823 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | BG300MN |
| Color | Steel |
| Length | 1.5'' |
| Quantity | 1 |
| Shipping Weight | 0.1 |
| Style | No Go Gauge |
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