Last year I had a barrel put on my Savage 12 action chambered in .223AI and it has never shot all that well. With extensive load development, bedding and a recrowning job the best I can get it to do is a 1" average at 100 yards. I picked up a neck sizing die and ran some brass through it and found that they would not chamber(could not close the bolt). That got me thinking that possibly there is a head space issue. If I FL resize the brass the rifle chambers just fine. Any thoughts? Possible solutions?