Let me add one other possible (easily solved) problem, that may be causing or aggravating your situation. Last year, while examining the fired brass from a newly built rifle using a new Rock River bolt head, I noticed that the rear faces of the cases were very chewed up ooking, compared to the empties I'd fired from my old reliable Colt, Investigation revealed that the edge of the recess in the new bolt head that bordered the inside of the extractor had a very sharp edge that was chewing the rear of the case head, and shaving off shreds of brass right into the extractor area. I'm sure that if I hadn't caught the problem after 30 or 40 rounds, those brass bits would have built up enough to start interfering with function. Disassembling the extractor from the bolt head, and lightly running a fine cut needle file over that edge a few times knocked off the sharp edge, stopped the chewing up of the case heads, and reduced the brass fouling in the bolt head area significantly. I know that your complaint was about ejection problems, but if your extractor isn't holding the case firmly enough after it comes out of the chamber, you are going to get ejection malfunctions. That's why the move in recent yrs to stronger extractor springs and (at least in my case) making sure the case head isn't dragging on the bolt face during extraction, or the extractor being pushed away from the bolt body by excess brass shavings.