6.5 Creedmoor Match Go-gauge
The "GO" gauge is most commonly used when installing a new barrel and reaming the chamber to size. The bolt should fully close on the "GO" gauge, if it fully closes you can be sure you have enough room in the chamber to prevent the cartridge from being crushed during chambering. The "GO" gauge can also be thought of as a minimum safe headspace gauge and the rifle's bolt must be able to fully close with it in the chamber.
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