RE: Making your rifle more accurate
How' s it shooting now? Also, how many shots have gone thru it? It may just need to be cleaned really good to get out any copper fouling. Powder solvents won' t remove copper. If it' s been shot ALOT, you may need a new barrel, or have that one set back into the action a tad more to get the rifling closer to the loaded round. Throat erosion could be the culprit there.
Take it to a good gunsmith and just ask to have it checked out as to why it won' t perform as you expect. Let him tell you what he thinks is wrong with it. If you go in with a list of things for him to do, without explaining anything to him, he may do them for you and you' d be no better off if it doesn' t fix the " problem" .
$200.00 is very reasonable for all that. Might check on truing up the action and lapping the bolt lugs too.