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Forster Products Sammi Dimensioned Headspace Gage, Rimless, Hardened Steel, Precision Ground, 257 Roberts, 6.5 x 257 Roberts, & 7mm Mauser, Field - Forster Precision Products, HG0257F
Forster Precision Products HG0257F
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UPC
757253004414
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257 ROBERTS: Use to check headspace of 257 Roberts, 6.5×257 Roberts, & 7mm Mauser (7×57) RIMLESS CARTRIDGE HEADSPACE: The proper use of Headspace Gages is the most reliable way to test rifle chamber length. Headspace in a rimless cartridge is the distance between the bolt face and a datum line, determined by SAAMI, where the front of the cartridge rests on its shoulder when the bolt is closed. FIELD: FIELD gages are slightly shorter than the SAAMI maximum in order to give a small safety margin. If a rifle closes on a FIELD gage, its chamber is dangerously close to, or longer than, SAAMI-specified maximum chamber size. If chamber headspace is excessive, the gun should be taken out of service until it has been inspected and repaired by a competent gunsmith. PRECISION MACHINED: Manufactured from top-quality, hardened steel and precision ground to ANSI and SAAMI tolerances. Headspace tolerance ground to a very exacting ±.00015. Each Headspace Gage thoroughly inspected with NIST-certified measurement tools to ensure the highest quality product. MEASURING MEANINGFUL HEADSPACE: Properly speaking, and for safety purposes, one measures “headspace” as the difference between the length of a standard cartridge, as represented by a gage, and the gun’s actual chamber length , when the head of the cartridge is flush against the bolt face.
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