I picked up a used 17-223 upper a while back; said to have been from the original owner and not shot much at all. So far its been pretty challenging in getting it running. I have sized and resized brass, small based dies,and bumping shoulders back,and still was having trouble getting the brass to chamber, and then once I did get some that would cycle through as empty brass manually cycling and then as loaded rounds I would shoot it and the brass would stick in the chamber and fail to extract. Got some virgin brass and it seemed to do a tiny bit better until I fired it. After more research I looked at the brass pretty close and can see that there is a 'scuff' mark completely around the case that encompasses the middle half of the case. It looks to me like polishing up or honing the chamber is in order. From what I am describing is this what any of you guys would do? Thanks for any input.
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