Had one with the same problem where the gunsmith said the barrel was neutral bedded the whole length. Went through load after load and it shot horizontal double groups. The rifle about made me crazy getting it to group. I prefer a rifle that will shoot almost anything well and load changes are for refining accuracy rather than finding accuracy.
Free floating didn't help. I bedded the tip and finally cut the barrel back two inches and recrowned. All problems went away.
