Savage 340 rifles have a pretty good reputation for accuracy, but they are difficult to attach a scope to and the triggers are very rough. They are well-built and rugged, but will never win any beauty contests. Most of them you find will have been carried much and shot little. Many were first deer rifles and were left behind as the kids grew up. To say they are homely is a compliment (as Randy Newman said- Mama says she's plain but that's just bein' kind, Papa says she's pretty but he's almost blind, can't take her out much except at night).
If you have a burr in the chamber, it can be polished out. You will never smooth out the bolt. It will never be a Mauser, but it might be a good truck gun. Don't sand the stock, it will never look right again.