Rob,
I've mentioned before, but I have a PX7 that I am almost 100% positive the metal rim was warped from being slabbed. I did not break the disc out, but just looking at it, it seems as thought the disc was "forced" into the gasket. I have other graded discs that don't exhibit this feature.
This is the main reason I have not submitted any discs for grading and probably won't until they come up with a different gasket.
I have some PSA graded P2's, but I have not noticed the same thing with those, although the way the gasket fits around the pin, it makes them appear slightly smaller.
Mike
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