The Forster Headspace Gage is designed to ensure accurate testing of chamber headspace. Headspace is the distance between the face of the breech and the base of the cartridge when the action is closed. Safety and accuracy are threatened when excessive headspace exists. For best results with bolt action rifles, remove the extractor from the bolt. The bolt must work freely in the receiver. It is impossible to have the proper feel for a gage if the bolt is tight or sticky. Insert the proper gage into the action. Attempt to close the bolt on the gage. CAUTION — Never force the bolt closed on a gage. A rifle with correct headspace should close easily and without feel on the GO (shortest) gage, but shuld not close on the longest gage in the set This eleven gage, hardened steel set of Rifle Chamber Headspace Gages allows you to accurately measure the headspace dimension of your rifle chamber. Headspace is the distance from the bolt face to the datum point in the chamber that stops the forward travel of a cartridge case. The set is very useful for precision rifle shooters, armorers, gunsmiths and reloaders. The set is precision ground to American National Standard (ANSI) tolerances and is supplied in .001” step increments. The ANSI tolerance for headspace gages is based on ANSI/SAAMI specifications. This 308 Win. chamber gage set starts with a 1.630”-length gage and progresses in .001” step increments. The longest gage is 1.640”.
The contents of the set are packed in reusable vials to sustain a clean, moisture-free storage environment. This set also checks the headspace of the 243 Win., 7mm-08, 358 Win., and 7.62 NATO* chambers. *Headspace check of 7.62 Nato requires a longer Maximum gage. Our p/n = HG762NATOMax
