I have a friend who is on his second barrel on a Super America and it still isn't right. Current issue is the chamber is not quite concentric to the bore but Kimber says it's "in spec".

One thing to keep in mind is that the Kimber's only feed rounds from the magazine. You can't just drop a round into the chamber and close the bolt like on a pre-64 Model 70 or Mauser. I have not seen one of the new Model 70's so have no comment on them.