I spoke with Thompson Center and they want to have a look at the barrel, so off it goes later this week. I will try removing the extractor pin before I send it back because I do have a suspicion that it is putting too much pressure on the case as it slides in/out. More play when inserting it means it doesn't matter so much, but after the brass has been fired I think it matters.
Anyways, once that pin is out if the brass is still sticky then it's definitely the barrel.
-Jeff
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