The Forster Products .303 British No-Go Headspace Gage (brand part no. BG303N) checks for excessive headspace on the rimmed .303 British cartridge, a caliber where correct chamber length matters just as much as on modern rimless rounds. If a bolt closes on this gauge, the chamber has been cut too long, which can be dangerous and can hurt accuracy. The gauge measures 1.5 inches and is a standard tool for anyone inspecting or rebarreling a .303 British rifle.

Key Specifications

• It’s built as a No-Go gauge for the .303 British chamber.
• The gauge measures 1.5 inches in length.
• It’s sized for the rimmed .303 British cartridge.

Frequently Asked Questions

What caliber is this gauge for? The .303 British cartridge, a rimmed round used in classic bolt-action rifles.

What happens if the bolt closes on this gauge? It indicates the chamber has excessive headspace, which can be dangerous and hurt accuracy.

Buy the Forster .303 British No-Go Headspace Gage

A dedicated No-Go check keeps a .303 British rifle’s chamber within safe tolerance. See more in our gunsmithing tools lineup and order from our Lubbock, Texas gun shop for fast shipping.