The Forster Headspace Gage (brand part no. BG303F) checks field-length headspace on rimmed and belted .303 British chambers. Headspace is the distance between the breech face and the base of the cartridge when the action closes, and excessive headspace is a real safety concern: unsupported brass fired in an over-length chamber can rupture and vent gas rearward toward the shooter. Forster machines this gage to precise, repeatable tolerances so a gunsmith or handloader can confirm a .303 British chamber is within safe field-length limits before firing factory or reloaded ammunition through it.

Key Specifications

• Checks field-length headspace on .303 British rimmed and belted chambers.
• Measures 1.5 inches.
• Precision-machined to repeatable tolerances for a reliable safety check.

Frequently Asked Questions

Why does headspace matter for safety? Excessive headspace lets unsupported brass rupture when fired, which can vent gas rearward toward the shooter; a headspace gage confirms the chamber is within safe limits before firing.

Is this a go-gage or a field gage? This is a field-length gage, used to check that headspace hasn’t grown beyond the safe field limit.

Buy the Forster Headspace Gage, .303 British

Order this Forster gage from our Lubbock, Texas gun shop for fast, direct shipping. See more from Forster Products or shop the reloading equipment catalog.