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From a Brownells how to:

On older military rifles:
An old military surplus rifle like a Mauser, Mosin Nagant, '03 Springfield, Enfield, Arisaka, and others may close on a NO-GO gauge. If it...

:confused: :rolleyes:

A Head Space Guage is used for measurement.

1.290"
1.295"
1.300"
Above are the USGI examples I used from TM9-1276_1947
Head space is MEASURED with a set of GO,NO-GO...

TM9-1276_1947
http://www.90thidpg.us/Reference/Manuals/TM9-1276_1947.pdf

Shows 1.290 (GO), 1.295 and 1.300 (NO GO) ... page 25.

Section 15 on pages 17-18 reads:
15. Headspace Gauging
a. The...