Call Krieger. There's something not right with that barrel. It should never have fouled more than lightly. They did something wrong and will make it right.
Anything else you do to eliminate the fouling is destructive to the barrel and if you fire lap it you own it. Krieger will not stand behind a barrel that has had Tubb or anyone else's Fire lapping product used in it. For that matter they may not stand behind it you get overly aggressive with bore paste.
Anything else you do to eliminate the fouling is destructive to the barrel and if you fire lap it you own it. Krieger will not stand behind a barrel that has had Tubb or anyone else's Fire lapping product used in it. For that matter they may not stand behind it you get overly aggressive with bore paste.