As others have said.......skim bed action, float barrel, and do a trigger job. If those three things don't create a shooter you will be looking at a new barrel.
77/22 Target sear and spring (#VC77TS) makes your trigger job easy:
https://www.volquartsen.com/Broughton makes excellent rimfire barrels for 22LR:
http://www.rifle-barrels.net/index.html