Specification Brand : Forster Products BulletPoint : GUARANTEED: This product is covered by a limited lifetime warranty provided by Wheeler. Please email support@wheelertools.com for assistance. BulletPoint1 : 30-06 SPRINGFIELD: Use to check headspace of 25-06, 6.5-06, 270 Win., 30-06, 8mm-06, 338-06, & 35 Whelen. BulletPoint2 : 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. BulletPoint3 : GO: Corresponds to the minimum chamber dimensions. If a rifle closes on a GO gage, the chamber will accept ammunition that is made to SAAMI maximum specifications. The GO gage is essential for checking a newly-reamed chamber in order to ensure a tight, accurate, and safe chamber that will accept SAAMI maximum ammo. BulletPoint4 : NO-GO: Corresponds to the maximum headspace we recommend for gunsmiths’ chambering new bolt-action rifles. This is not a SAAMI-maximum measurement. If a rifle closes on a NO-GO Gauge, it may still be within SAAMI specifications, or it may have excessive headspace. To determine if there is excessive headspace, the chamber should then be checked with a FIELD Gauge. The NO-GO Gauge is a valuable tool for gunsmiths’ reaming new chambers, in order to ensure tight and accurate headspace BulletPoint5 : 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 Gauge, and the gun’s actual chamber length , when the head of the cartridge is flush against the bolt face. Caliber : 0.45 Color : Multi CustomerPackageType : Standard Packaging Department : unisex-adult ExternallyAssignedProductIdentifier1 : 0019321718822 ExternallyAssignedProductIdentifier2 : 019321718822 ExternallyAssignedProductIdentifier3 : 00734307902551 FinishType : Brushed GpsrSafetyAttestation : 1 HandOrientation : Left/Right ImportDesignation : Made in the USA IncludedComponents : Double Cavity Bullet Mold ItemDisplayDimensions_Height : 2 inches ItemDisplayDimensions_Length : 21 inches ItemDisplayDimensions_Width : 8 inches ItemDisplayWeight : 1.5 pounds ItemName : Forster Products 30-06 GO & NO-GO Headspace Gauge Set, 25-06, 6.5-06, 270 Winchester, 30-06, 8mm-06, 338-06, & 35 Whelen, SAAMI Dimensioned, Rimless, Hardened Steel, Precision Ground ItemPackageDimensions_Height : 17.2 centimeters ItemPackageDimensions_Length : 2.9 centimeters ItemPackageDimensions_Width : 11.3 centimeters ItemPackageQuantity : 1 ItemShape : Rectangular ItemTypeKeyword : gunsmithing-tools-and-accessories Manufacturer : Forster Products Material : Aluminum Material1 : Blend Material2 : Blend Material3 : Blend Material4 : Blend Material5 : Blend ModelName : 90255 ModelNumber : LP90255 NumberOfBoxes : 1 NumberOfItems : 1 NumberOfRounds : 1 PackageLevel : unit PartNumber : LP90255 Pattern : Solid ProductDescription : 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. ProductSiteLaunchDate : 2017-04-14T07:00:00.000Z Size : Diameter: 0.515" Style : Classic SupplierDeclaredDgHzRegulation : not_applicable TargetAudienceKeyword : men UnitCount : 1 UnspscCode : 49000000 WarrantyDescription : See manufacturer