MD,
In the way of exhausting research…
Coating thickness testing is yet another dimension… but I would think people end up on the heavy side more than the light side…
But the only way to check is with a gauge.
Huh.. I could go to a gun store and measure a bunch of commercial coating - I haven’t done that yet.
Here is the one NIC resells - if you get into testing they’d probably loan you one, they aren’t too expensive but past QC they have limited use.