BR, I was puzzled by the #7 comment on closing with light finger pressure, is it just friction from turning the bolt and finishing the cocking? Or is it something more? At any rate if the go gauge does close with slight or no effort (when centered) indicates the head space is OK.
The reason I had to get the new reamer was the first was made wrong and the chamber was tight just in front of the rim. The cases fed a little tight but extracted very hard. Also resized cases would not chamber. This would be highly unlikely on a used original barrel.
If there is some defect on MilSurpShooter's barrel extractor cut that causes extra effort to close it would be just a nuisance and not a safety issue. If he has some cases that will not chamber and some that do, then the issue needs to be cleared up so have will not have to be sorting brass.