Short answer, sure. There's always a chance.
Concentricty gauge? I'd personally hold off.
There are so many variables that come into play with manufacturing your own ammunition. Personally, I'd ensure that all of your quality control processes are being religiously followed first.
Build each cartridge as if it is the last one you'll ever shoot.
IF you shoot well and if the gun is doing its part, chances are it'll hold within a minute and may occassionally surprise you with a half minute.
When you get to this point and then decide you want more, only then would I consider the investment of more sophisticated gauging and instrumentation.
Actually, first I'd make sure the gun was tuned up real good. New barrel, action work, bedding, good glass, trigger, stock.