The Forster Products .300 Win Mag Go Headspace Gage (brand part no. BG300MG) checks the minimum end of a .300 Winchester Magnum chamber, confirming a rifle’s headspace falls within safe S.A.A.M.I. specification before it’s fired. Headspace is the distance between the face of the breech and the base of a chambered cartridge when the action closes, and getting it wrong in either direction can be dangerous or hurt accuracy. This Go gauge measures 1.5 inches and is a standard tool for any gunsmith chambering or inspecting a .300 Win Mag rifle.

Key Specifications

• It’s built as a Go gauge for the .300 Win Mag chamber.
• The gauge measures 1.5 inches in length.
• It checks headspace against S.A.A.M.I. specification.

Frequently Asked Questions

What does a Go gauge check? It confirms a chamber isn’t cut too short, verifying headspace falls within the minimum safe S.A.A.M.I. specification.

Why does headspace matter? Incorrect headspace, in either direction, can be dangerous and can hurt accuracy.

Buy the Forster .300 Win Mag Go Headspace Gage

A precise Go gauge keeps a .300 Win Mag chamber within safe spec before it’s ever fired. See more in our gunsmithing tools lineup and order from our Lubbock, Texas gun shop for fast shipping.