Q. I have an old set of Headspace Gages in 30-06. The Go length is marked 1.940” in length. Why are your new Headspace Gages for 30-06 marked with a different dimension?
A. In 1990 we started marking the 30-06 Headspace Gages with the new SAAMI specified national standard markings. For example, the Go length is 2.0487”. We did away with the former Army ordnance markings to be consistent with all our other gages. The pre-1990 and post-1990 gages are identical in all ways, only the markings have changed in order to be consistent with National Standards.
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