Manufacturer: Forster
Brand: Forster Products
This gauge set is for the following mag calibers: 264 Win Mag, 30-338 Win Mag, 300 Win Mag, 338 Win Mag, 458 Win Mag, (275, 300 & 375 H&H Mag), 308 Norma Mag, (257,275,7mm, 300 & 340 Weatherby Mag), 358 STA, (350 & 416 Rem mag), (257 & 6.5 STW), (6.5,7mm,8mm Rem Mag). The GO gauge is used to measure the minimum allowable, safe chamber headspace. If the bolt does not close on a Go gauge, it is considered unsafe. The NO-GO gauge is used to measure the Maximum recommended chamber headspace. If the bolt closes on a NOGO gauge, it is out of the recomended good condition range, and should then be checked with a Field Gauge to determine if it is still safe headspace. When setting new headspace such as for a rechamber job the bolt should not close on the NO-GO gauge. This gauge set ships only in the USA, No export or APO.