Raimey,
Your initial post about Mr. Noody indicated that he uses 6mm bullets to make .228 bullets, but now I glean from your posts that he actually uses 6mm jackets (not bullets) to make jackets for .228" bullets. That makes much more sense since the core would not be in the jacket while he is reducing it. The core wouldn't be added until before the point forming operation, therefore wouldn't be loosened from the jacket. His comment about thicker jackets resulting also makes sense.
Mike