In my humble opinion all this "break in ritual"has much credibility asvoo-doo and conspiracy theories. So long as the gun is initially cleaned and cleaned again after the first 10-30 rounds there should not be a problem. Do not let the barrel get hot.Light weight rifle barrels heat up very quickly.

i do not use abrasive cleaners in my gun barrels. It is really easy to get the copper fouling out with a good copper solvent if you clean the gun on a regular basis.