At Clymer, we manufacture our Headspace gauges from precision ground hardened US steel to SAAMI’s ANSI tolerances.
Headspace is the distance between breech face and the base of the cartridge when the action is closed. It is best to remove the extractor, ejector, and firing pin from the bolt to achieve optimal results when checking headspace.
The use of both GO and NO-GO headpsace gauges is essential for all newly reamed chambers. This ensures a safe and accurate chamber that will accept SAAMI maximum ammo. Warning – Never force an action closed on any gauge.
Clymer offers GO and NO-GO lengths on all Standard calibers as well as FIELD lengths on Rimless Rifle calibers.
We produce manufactures incremental Sets. These sets include 11 gauges, each one clearly marked in .001″ increments. This gives you the ability to know precisely your chamber depth.
Below you will find our Headspace Gauge Interchangeability Sheet. Some SAAMI calibers use the same headspace gauge as another caliber. ** This is not a list of Gauges we manufacture, that list is found on our “Product Page”
| Gauge Name | Also Used With These Calibers |
| 22 LR | 22 Short, 22 Long, 22 Bentz, 22 Match |
| 22 WMRF | 22 WRF, 17 HMR, 22 RF |
| 22 HORNET | Hornet Based Wildcats |
| 223 REM | 6 x 45 |
| 25-20 | 218 Bee, 218 Mashburn Bee, 32-20 |
| 7 x 57 | 257 Roberts |
| 284 WIN | 22/284, 6mm/284, 25/284, 6.5/284, 270/284, 30/284, 35/284 |
| 308 WIN | 243 Win, 7mm/08, 358 Win, 260 Rem |
| 30-06 SPRG | 25/06, 6.5/06, 270 Win, 8mm/06, 338/06, 35 Whelen |
| 300 RUM | 375 RUM, 7mm RUM |
| 300 WSM | 270 WSM, 325 WSM, All 300 & 270WSM Based Case (NOTE: 7mm WSM is Different) |
| 30-30 WIN | 219 Zipper, 219 Zipper Imp, 219 Don-Wasp, 25-35, 7-30 Waters, 7mm Int’R, 30-30 Based Wildcats, 30 Herrett, 303 Savage, 307 Win, 32-40, 32 Win, 356 Win, 357 Herrett, 375 Win, 38-55 Win |
| 30-40 KRAG | 303 British |
| 357 MAG | 256 Win Mag, 357 Max, 38 Special, 22 Rem Jet |
| 44 REM MAG | 44 Special |
| 45-70 GOVT | 33 Win, 348 Win |
| BELTED | .535″ Based Belted Calibers, 300Win, 350Rem, 375H&H |
| BR Rem | 22 Rem BR, 6mm Rem BR, 7mm Rem BR |