My apologies. I probably should have just told you "It doesn't shoot" rather than give you more false hope.
I was discussing this with a friend the other day. I too have an AR barrel that doesn't shoot. I foolishly tried lots of different loads in it to no avail. This friend told me I should have bench rested it too. He seemed almost insulted when I told him that if it won't shoot with a 69 or 77gr Sierra and 23.5-24.5gr of Varget or Re-15 that it won't shoot and you should stop wasting your time.
It sure is easy to get caught up in the "try this, try that" BS.