Bill,
I was in no way insinuating anything about manufacturer quality control, etc. I don't believe that was the case at all... just a matter of different standards - one uses a different number, no more, no less.
tensnxs,
Honestly, it doesn't really make a bit of difference what that chamber measures with your set of headspace gauges. I'd advise you put them away and forget about 'em unless you are chambering a gun or setting up something like a Savage w/ barrel nut.
Really.
Adjust your dies to cases fired in your chamber. It could be undersized, oversized, or somewhere in between and it won't matter a damn after the first firing. Take your fired cases, measure them with a Stoney Point or Hornady comparator, an RCBS Precision Mic, or a barrel stub from the gunsmith, whichever tickles your fancy, bump them back a little,0.001-0.002 for a slow-fire bolt gun works pretty well in my experience) and call it a day. At that point, the only measurement that matters is relative to your fired case dimension - what it is relative to some arbitrary case gauge standard really doesn't affect a thing. Yes, it stinks having multiple guns of the same caliber, all with different headspace values - but thats life unless you do your own barrels or have the same gunsmith do all the work. If you are using a regular 7/8-14tpi press,other than a Forster Co-Ax) the Redding competition shellholders that Jay mentioned work very simply and quickly for this - size a case w/ the +0.010" shell holder, measure to see if it got bumped enough. If not, try the +0.008" one, and re-measure. Once you find the one that gives you the right amount of bump, write it down somewhere - saves on re-measuring when you go to set up the dies again after a long lay off,DAMHIKT!!!).
Now if your sizing die cannot squeeze the case enough - and it does happen - then you might use the headspace gauges to see if it is the chamber or the die at fault. Otherwise, leave 'em in the drawer and get busy loading and shooting!
Good luck,
Monte