Right people a mate has just loaded some home loads cal 223 and he resized brass not just neck and they don't fit in his chamber ie they prob would if you slammed the bolt forward but I said it's not recommended to do that it's a tikka and it's had a new barrel on it this is not the first time he has had probs? All cases under max and coal under make??? ??? Now I reckon it's hitting the shoulder of the brass as it's slightly brighter when you try to chamber the round any thoughts ????