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Never really had the 1.630 question answered only double talk .
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You should put some effort into answering your own question. I start out with a lot of given; the datum diameter of the 30/06 is .375", the datum diameter of the 308 W is .400" and the datum diameter for the 300 Win Mag is .410".
The 1.630 you are having trouble should be expressed as 1.630", if you can not come up with a datum that is .400" in diameter forget about verifying the gage. That applies when checking magnum cases with a .410" diameter, round hole datum.
Many years ago I suggested the datum was not a line, I suggested it is a circle/round hole and the round hole datum for the 30/06 family of cases was .375". And then I suggested reloaders drill a round hole with a 3/8" diameter drill bit and or use a 3/8" reamer with an undersize hole. Instead they head for the hardware to purchases bushing with 3/8" holes with no clue the radius at the end of the hole defeated the purpose of the datum like Sinclair/Hornady.
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answered only double talk
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RC20 repeats an old quite from 'guess who?' The quote goes something like "reloading is not for everyone".
You are very selective about members that you participate with, I suggest you ask one of them what is the difference between 1.630 and 1.630". I also suggest you ask one of them what the 1.630" represents; because you believe the datum is a joke good luck verifying the gage, case, chamber and die.
F. Guffey