Originally Posted by
Curlew
Thanks — I had missed that section. It does give a blueprint for the gauge, but as far as I can see SAAMI remains essentially silent on the question of what length dimensions to use for “GO” and “NOGO” (never mind “FIELD”). They just have to be somewhere between chamber MIN and MAX.
So e.g. if I wanted to emulate what Sam Colt and Uncle Sam use for the M16 chamber, I could make a pair of gauges per the Z299.4 print, one with F=1.4646 and another with F=1.4706, labeled “Sams GO 223 Rem” and “Sams NOGO 223 Rem” respectively, and that would comply with SAAMI guidance.
My point is basically to echo Todd.K: if the gauge doesn’t have a length marked on it, it’s hard to know what you’ve got. If it’s a military gauge made to a specific drawing, great. But if it’s a commercial gauge that just says “NOGO” or whatever, it could be almost anything, even for a SAAMI-supported cartridge.
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