I've taken to using those cloth barrel cleaners that have the wire brush built in. Just drop the jag down the bore, apply some Break Free to the bristles, and pull it through.
There's no chance of damaging the rifling or the crown using them.
They fold up nice and tight so they fit into a cleaning kit, too.
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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 !!!!