The "Go" and "No-Go" gauges are most useful when you're cutting a chamber. Typically you cut a new chamber to size so that the action closes on a "Go" gauge and will not close on a "No-Go" gauge.
There is also a "Field" gauge, which (by itself) can help ensure that an existing chamber / bolt train combination is safe to fire.
The bolt should never completely close on a "Field" gauge.
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 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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