Laquered wolf cases? if so that may be the problem, I missed that the first time around. I would foam and clean the chamber with everything you have.
Ok, doesn't sound like increased carrier speed so have you trimmed the cases to length lately? Something is causing the cases to stick, it could be long or large dia. cases, a groove or rough spot in the chamber or high pressure. Look at the case for any signs of a rough chamber .
The 6.8 is the fastest growing cartridge and #1 choice for hunting deer and hogs with an AR15.
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