And if it is a bit pitted and doesn't shoot that well, check the crown, and if necessary re crown it. The key to accuracy is the last inch or indeed the last 1/16" of an inch of barrel and that the crown is nice and square with the barrel. If necessary you can recrown with a brass ball, drilled to take a peg to allow it to be chucked, and some lapping compound. The principle is that a ball and a round hole will always sit square if properly seated. Borescopes are great for creating work for gunsmiths, and whilst the rifle may not shoot 1/2" groups at a 100 yes, it will probably still shoot minute of fox at Hornet ranges.