Foster head space gauge for the 223 Remington cartridge. This auction is for a set of GO and NO GO gauges. Guaranteed quality and condition of excellent. The information below is from Foster.
Every gunsmith knows that proper use of a headspace gage is the most reliable way to test the length of a rifle chamber. "Headspace" is the distance between the face of the breech and the base of the cartridge when the action is closed, and excessive headspace can be dangerous as well as impair accuracy. For instance, unsupported brass fired in a rifle action with excessive headspace can rupture, allowing gas to blow rearward like a rocket exhaust.
Because your safety is on the line, Forster Headspace Gages are made with painstaking care and exacting manufacturing standards to ensure accurate testing of your rifle's chamber.
Important Guidelines For Measuring Headspace:
If a rifle closes on a GO gage, the rifle chamber will accept any ammunition that is made within S.A.A.M.I. (industry standard) specifications.
If a rifle closes on a NO GO gage, the rifle chamber might have excessive headspace. Most gunsmiths chamber a rifle's headspace between the GO and NO GO dimensions.
If a rifle closes on a FIELD gage, rifle chamber is dangerously close to or already over the S.A.A.M.I. specified maximum chamber size. If chamber headspace is excessive, the gun should be taken out of service until it has been repaired.
When checking headspace, a stripped bolt and removal of the firing pin will make it easier to feel the action closing on the gage. Some shooters are under the misconception that the headspace of a gun is fixed over the life of the firearm. Headspace can increase after repeated use of ammunition that causes too much pressure. Handloaders should routinely check headspace every thousand rounds.
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