Yeah he was a nice guy an talked for about a half hour. He runs a shooting school in durango colorado called evil roy shooting school.
As to barrel break in I will shoot three rounds, clean with sweets 7.62 an patch till clean an dry.
Run a patch down with militec1 on it an shoot 3 more rounds an repeat that process. About a dozen times. That process is for my new rifles / barrels.
If I have an old gun an the bore looks good I will have the barrel set back a few thousandths an a new crown cut an the chamber “recut” after extensive cleaning.
One I did this to was a old smle enfield I converted to 7.62x54R an it is very accurate.
One thing I do is clean the firearm every 24 hours times 3 days as the pores in the metal will put carbon black back on the patch for at least three cleanings after shooting in my experience.
Stay safe !!!!