Is there a limit to how many rounds down a tube before having it treated? Say for instance I have a barrel that probably has 2500rds through it, shoots *really* nice, probably one of the best shooting barrels I've had to be honest - and it only seems to get better with more rounds through it. Problem is the throat has moved a bit and if it moves much more, well it'll be too much. Yes, I could have it set back first but its one of those things where its shooting so well I *really* don't want to screw with it - but if I could 'preserve' it at this point and get another several thousand rounds of it that would be pretty awesome ;D