I would suggest the go-gage, for most it is no more than something to talk about, If I had one I would use it as a transfer, or a standard or a tool to adjust another tool to .005? (30/06), again, to most it is something to talk about.
Again, if I had one I would modify it to a go, no and beyond gage, methods and techniques allows my money to go further.
I make gages, I take a measurement from the chamber, to the press and back to the chamber, without all the commercial tools. Maximum overall length (COL), I drill the flash hole/primer pocket, I size the case, I seat a bullet, I chamber the test case, then with a cleaning rod to push the bullet out of the case with a cleaning rod until the bullet hits the lands, when the test case is removed from the chamber, is is maximum overall length. And, again, I am THE FAN of bullet hold, I can not have enough bullet hold, I can measure bullet hold.
When removed from the chamber the test case becomes a transfer when setting up the seater die, once the seater die is adjusted it is adjusted to .000 off the lands, and if by now the rleoader has acquired enough skill, methods and techniques to measure the length of the chamber (and if at the instance the case must be fired 4+ times for maximum growth) the reloader can add the difference in the length of the chamber from the shoulder of the chamber to the head of the case to the length of case from the head of the case to the shoulder of the case.
Tools do not make the reloader first class regardless of the methods there is not .001 thousands difference in the results.
F. Guffey