RE: Breaking in a New Gun
Always seems to be two very different camps when it comes to 'breaking in barrels'. Personally I believe it is a waste of time. Shoot and clean it as you would if it were decades old.
There is no way to prove that it either works or it does not. Some factory rifles actually shoot a bit better fouled just a bit.
Pay close attention to the post that included the part about more barrels being ruined by improper cleaning than not being cleaned often enough or at all. Nearly every major barrel maker will say exactly the same thing but not all of them agree on 'breaking in' a barrel.