Headspace Gage to Caliber Interchangeability Tables

Rimmed and Belted Gage to Caliber Interchangeability Table

Use the Following Gage	To Check Any of These Calibers
22LR (RIMFIRE)	22 Short, 22 Long, 22 LR Match
30-30 WCF	19 Zipper, 219 Donaldson Wasp, 219 Zipper, 225 Win, 22 Savage Hi Power, 25-35 WCF, 7-30 Waters, 7mm Int. R, 30 Herrett, 303 Savage, 32 Win Sp., 307 Win, 32-40, 356 Win, 375 Win, 38-55 WCF
STANDARD BELTED MAGNUM .535 in. Diameter	257 Wby, 257 STW, 264 Win, 6.5 STW, 6.5 Rem Mag, 270 Wby, 275 H&H, 7mm Rem Mag, 7mm Wby Mag, 300 H&H, 300 Wby, 300 Win Mag, 30-338 Win Mag, 308 Norma Mag, 338 Win Mag, 8mm Rem Mag, 340 Wby, 350 Rem Mag, 358 STA, 375 H&H, 416 Rem, 458 Win Mag
LARGE WBY MAGNUM .603 in. Diameter	30-378 Wby, 378 Wby, 416 Wby, 460 Wby

Rimless Gage to Caliber Interchangeability Table

Use the Following Gage	To Check Any of These Calibers
22-250	22-250
PPC	22 PPC, 6mm PPC
220 Swift	220 Swift
222 Rem	222 Rem
222 Rem Mag	222 Rem Mag, 6 x 47
223 Rem*	223 Rem, 6 x 45
243 Win**	243 Win, 260 Rem, 7mm-08, 308 Win, 358 Win
244 Rem	244 Rem, 6mm Rem-244
250 Savage	250 Savage
6.5 SKAN	6.5 SKAN
6.5 x 55 Swede	6.5 x 55 Swede
257 Roberts	257 Roberts, 6.5 x 257 Roberts, 7mm Mauser (7 x 57)
280 Rem	280 Rem
284 Win	284 Win, 22-284, 6mm-284, 25-284, 6.5-284, 270-284, 30-284, 35-284
30-06 Springfield	25-06, 6.5-06, 270 Win, 30-06, 8mm-06, 338-06, 35 Whelen
8 x 57 Mauser***	8mm Mauser (8 x 57)

* 5.56 NATO rifle chambering requires a special, longer headspace gage.
** 7.62 NATO rifle chambering requires a special, longer headspace gage.
***Used for checking rifles with current SAAMI-specified 19° shoulder angle. Some older rifles were chambered to 20° 48’. Special gages are available. See 8 x 57 Mauser (8mm Mauser) Chamber Headspace Variation and Measurement for further information.