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Originally Posted by Mauser720
With the variance of only .009 it is initially difficult to imagine that the removal of a date or a crest (for example) could not be detected in this manner.
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I would tend to agree. Even if a date stamp was only .010" deep, it would still likely be outside the specs if it was removed...but remember to measure off the stamp itself, as the edges of the stamp will raise up...
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So our effort to collect measurements does not (in my opinion) need to focus on the high end guns. Instead, it needs to focus on collecting measurements for the ordinary examples. And we can sort them by year and type.
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Sounds cool. I'm in.
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There are already other ways to create an uproar at a gun show. Pull out your jeweler's loupe to look at a Luger. Ask if you can take it apart and look at the serial numbers.
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Those will arouse interest surely; as people will assume you are "on to something", and will linger to see what it is...but pulling out a mic and measuring the chamber hood can only mean that you suspect a fake...
Danger Will Robinson!!! 
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A few questions: Where did you get your Starrett dial vernier? Would that be the one you would recommend for a novice like me? Would Brownells be a good source?
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I got my dial verniers some 28+ years ago; one like this will cost you ~$100 now...Mitutoyo makes good tools, too...as do Brown & Sharp, etc...I'd stay away from Sears...I'd check out eBay for a Starrett, as machinists are always upgrading (that's how I got this one!)...
I buy my tooling from
Travers online; they send out a 3" thick catalog to me once a year. They list both Starrett and Mitutoyo...
But remember I am old-fashioned; I stick to what I learned with many years ago...Nowadays you can get digital readout verniers that eliminate any chance of your getting the main reading wrong (it happens)...
As I commented, I have mics...but if you are measuring a beautifully blued finish, then a mic may scratch that finish...You 'drag' a mic's anvil across the piece to be measured...and it takes a [very] little practice to get the tension "just right"...
I do know that Brownell's has verniers for reloading; I don't know how precise they are...