The Forster Rimmed and Belted Headspace Gauge in .257 Roberts NO-GO (brand part no. HG0257N) is the companion check to the GO gauge, used to flag a .257 Roberts chamber that may already have excessive headspace. A headspace gauge tells a gunsmith exactly where a rifle’s chamber falls relative to SAAMI spec: too much headspace lets a cartridge move too far forward before the primer or case head is fully supported, risking a case rupture on firing. Forster builds these gauges to painstaking tolerances for exactly this kind of safety check.

Key Specifications

• Ground as a NO-GO gauge to flag excessive headspace in a rimmed and belted .257 Roberts chamber.
• Precision length of 1.8 inches for consistent, repeatable results.
• Supplied as a single gauge sized specifically for the .257 Roberts cartridge.
• Weighs approximately 0.1 pounds, light enough to carry in a range bag or tool kit.

Frequently Asked Questions

What does it mean if my bolt closes on this NO-GO gauge? If the rifle’s bolt closes on a GO gauge, the chamber will safely accept ammunition built to SAAMI industry-standard dimensions. If the bolt closes on a NO-GO gauge, the chamber may already have excessive headspace, and if it closes on a FIELD gauge the chamber is dangerously close to, or already beyond, the maximum SAAMI-specified size. Most gunsmiths aim to keep a chamber cut somewhere between the GO and NO-GO dimensions.

Who typically uses a NO-GO gauge? Gunsmiths use it after chambering a new barrel or rebarrel job, and handloaders use it to verify an older rifle’s chamber hasn’t stretched with use.

Buy the Forster Rimmed and Belted Headspace Gauge, .257 Roberts NO-GO

Don’t guess about chamber safety on your .257 Roberts rifle. Pick up this gauge in our reloading equipment lineup, and our Lubbock, Texas team will get it on its way.