They use standard go and no go gages, the precision made gages are the way to go, FWIW this and the Nut are the reasons you can pull 100 savages in the same caliber off the shelf and their headspace will all measure the same, Whereas out of 100 Remington you are apt to find 1-2 that let the bolt close completely on a NO GO , I have seen two, both were brand new 700 SPS's one in 22-250 and one in 223 ::)
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