Dave, on a 12 ga., .010" is supposed to be closer to IC .......... and a .015" is usually considered LM. But, as I said earlier, the important thing is that whatever you've got screwed in there patterns like you need it to, regardless of measurements. If you're pleased with the pattern spread and uniformity that's what counts.
Not saying yours are, but there is some terrible quality control with some of these original manufacturer choke tubes. My experience is that many aftermarket company's tubes are held to a much, much higher standard.
SRH
