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A third gauge, the "Field" gauge (slightly longer than "no-go"), is used in the field to indicate the absolute maximum safe headspace. This gauge is used because, over time, the bolt and receiver will wear, the bolt and lugs compress, and the receiver may stretch, all causing the headspace to gradually increase from the factory specifications ...
The headspace gauges are not different because of some rounding, or military "intelligence," but NATO chose to extend the headspace beyond what the .308Win chamber found acceptable. The .308Win rifle must have a headspace under 1.638" (the Field Reject dimension). Any headspace longer than this is unsafe for .308Win ammunition (having a thinner ...
The .308 Winchester has a 3.64 mL (56 gr H 2 O) cartridge case capacity. [9] The exterior shape of the case was designed to promote reliable case feeding and extraction in bolt-action rifles and machine guns alike, under extreme conditions. .308 Winchester maximum C.I.P. cartridge dimensions. All dimensions in millimeters (mm) and inches.
Pre-chambered "Drop-In Ready" barrels can be purchased, and the correct headspace is set using a proprietary barrel nut design. The barrel is threaded to fit the Ruger action threads. This way, a competent gunsmith only needs an AR-15 barrel wrench and proper headspace gauges to fit a new barrel. [14]
In this process it is important so set the correct headspace. [2] Correct mounting is important both for safety and accuracy. [3] If the barrel, receiver and bolt are not fitted properly, severe and potential fatal problems can arise due to faulty headspace, e.g. cartridge overpressure and case rupture.
.308 Winchester: the commercial name of a centerfire cartridge based on the military 7.62×51 mm NATO round. Two years prior to the NATO adoption of the 7.62×51 mm NATO T65 in 1954, Winchester (a subsidiary of the Olin Corporation) branded the round and introduced it to the commercial hunting market as the .308 Winchester.