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. 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, the rifle chamber is dangerously close to or already over the
S.A.A.M.I. specified maximum chamber size. | |