Saw exactly the same thing some years back in not one, but FOUR 6.8 SPC M700s. Shooting three or four inches at 100 meters, and that was from a machine rest. Ran the bore scope in and found that the rifling stopped well into the throat . . . on one side. On the other side, the rifling came all the way down to the case mouth, stopping abruptly at the step of the chamber. Did a chamber cast of all four, and they were all identical. Don't know what the angle was (and really didn't care), but they were all the same, obviously chambered on the same set up with the error repeated precisely in all four. Big Green seems to be making an effort to get this sort of issue cleaned up, but I'm still very cautious about buying a newer Remington these days. As long as they're marketing to the Wal-Mart crowd instead of gunshops and serious shooters, we'll probably continue see this from time to time.