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Base Belted (.535 Belt) Rifle Cartridge Headspace Gauges

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$47.00

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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.
  3. FIELD: Corresponds to the longest safe headspace. If a rifle closes on a FIELD gauge, its chamber is dangerously close to, or longer than, SAAMI’s 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. FIELD gauges are slightly shorter than the SAAMI maximum in order to give a small safety margin.

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.

  • 244 H& H
  • 257 Weatherby Magnum
  • 257 STW (Shooting Times Westerner)
  • 264 Win Mag
  • 270 Weatherby Magnum
  • 275 H&H
  • 300 H&H
  • 300 Weatherby Magnum
  • 300 Win Mag
  • 308 Norma Mag
  • 338 Weatherby Magnum
  • 338 Win Mag
  • 340 Wby Mag
  • 350 Rem Mag
  • 358 Norma Mag
  • 375 H&H
  • 375 Super Mashburn Mag
  • 375 WBY Mag
  • 357 STW
  • 400 H&H
  • 416 Rem Mag
  • 416 Taylor
  • 425 Express
  • 458 Lott
  • 458 Win Mag
  • 7mm Rem Mag
  • 7mm STW
  • 7mm Mashburn Super Mag
  • 7mm Practical
  • 8mm Rem Mag
  • Most Of The Ackley Improved Mags

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[.a]Base Belted (.535 Belt) Rifle Cartridge Headspace Gauges

[.a]Base Belted (.535 Belt) Rifle Cartridge Headspace Gauges

Please Select Gauge Type:

(Receive a discount when you purchase all three Gauges.)

Download

Compatible Headspace Chart

Gauge to Caliber Interchangeability Chart

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