I have a bad habit of buying bolt action rifles new and used, then doing general accurizing, witch includes what ever I can do myself. Once I get it shooting I tend to sell them pretty quick to get to the next project. Some I get shooting really well others need more work than I am capable of. What I do first is strip all the accessories off (ie scope, rings, mounts etc.). I take out the action and disassemble the bolt if I can. At this point I inspect all working parts and clean the heck out of everything. I have a home made foul out electronic barrel cleaner. It works wonders on those really bad barrels. At this point I lube and reassemble everything. Work up the best hand loads I can, you can't get the most out of a rifle without hand loading tuned loads. I strip off the scope and mounts ect. because it's fun and when I reassemble everything I know they are mounted right and tight. It is amazing how many rifles start to shoot great at this point. If that doesn't work then I check for any touchy binding spots as well as check to make sure the scope mount and action screws aren't to long, especially if they look like they were replaced at some point, shoot again. If I am not there, then I free float the barrel and bed the action, might as well do both well the action is out again. Shoot again, if still not there I place a pressure point at the end of the stock adjusting it back and forth. If it still won't shoot I try Tubbs final finish fire lapping. If nothing helped I bring it to a smith, or just sell it with a warning of accuracy issues. What I find that gives the most accuracy gain is a good cleaning, using reloads, bedding the action and floating the barrel, all of witch is very cheap if you can do it yourself. Another point is to have a good trigger pull but I don't touch that one myself unless it is an adjustable trigger, I have a good trigger smith I use for that.