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308 Winchester SAAMI Headspace Gauges

New product

Items that are in stock will ship within 7 days. If not in stock, this item is custom made to order.

$39.50

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Pacific Tool and Gauge offers three lengths of headspace gauges per rifle caliber. In order from the shortest to longest, they are: GO, NO-GO, and FIELD:

  1. GO: Corresponds to the minimum chamber dimensions. If a rifle closes on a GO gauge, the chamber will accept ammunition that is made to SAAMI’s maximum specifications. The GO gauge is essential for checking a newly-reamed chamber in order to ensure a tight, accurate and safe chamber that will accept SAAMI maximum ammo. Although the GO gauge is necessary for a gunsmith or armorer, it usually has fewer applications for the collector or surplus firearms purchaser.
  2. NO-GO: Corresponds to the maximum headspace Forster recommends 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 checking a newly-reamed chamber in order to ensure a tight and accurate chamber.

Cross-compatibility: Many of our headspace gauges are compatible with multiple chamber specifications. For instance, .30-06 Springfield headspace gauges are usable in .25-06, .270 Winchester, 6.5-06, 8mm-06, .338-06, and .35 Whelen chambers. We list known compatible chambers with each headspace gauge product. Refer to our Compatible Headspace Gauge Chart below or ask your sales representative if your gauge is cross-compatible.

  • .243 Winchester
  • .22-243 Winchester
  • .25 Super
  • .260 Remington
  • .270-08 / .270-308
  • .308 Winchester
  • .338 Federal
  • .338 Federal (CIP)
  • .338-08 Winchester
  • .338-358 Winchester
  • .358 Winchester
  • 6.5mm Panther
  • 6.5mm-08
  • 7mm-08
  • 7mm-08 Remington
  • 7.62mm x 51
  • 7.62 NATO