thats why, i said to use the cleaning equipment i did
plus, remember to wipe with the bore brush, only one way, and not back and forth. its been common, to always punch a bore of a rifle, the same direction the bullet comes out, and opposite on a handgun. (im not sure why, i always go chamber to crown on evertything)
I always use coated one piece rods, no metal brushes, and always swab from chamber to crown. youll never wear a bore out by doing that. And im not trying to disprove the 'more have been worn out by cleaning than by shooting' statement but, we clean our weapons in the army ALL the time, and quite meticulously as well. never wore one out that way.... In fact, some of the best shooting i did, was with an ooooold M16A1, that must have been cleaned a hundred thousand times in its lifetime.
as far as the good shooting a little better after the copper has filled in some of the imperfections is true, and thats why one breaks in a rifle barrel. its smoothing it out in a way. look it up on google, im sure theres a million webpages on breakin in a barrel. they can word it better than i im sure. All I know is, the best of the best barrel makers, firelap (break in their barrels) before they even send em out to the customers. and, when our sniper rifles get rebarreled, they get broken in too.