I'm no expert but weren't locking bolts and springs an issue with some? There are different style bolts (flat, stepped & 2 piece) depending on the age of the barrel. Maybe swap out the bolt & spring on this barrel with one of your other good shooting barrels?

Charter Member
Ancient order of the 1895 Winchester

"It's an insecure and petite man who demands all others like what he likes and dislike what he dislikes."
szihn