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Doubt that his one cleaning job ruined the bore. Hopefully he cleaned it from the chamber end.  If he cleaned it from the bore end, he could have dinged a land or the crown. Easy fix. About $80 to cut and recrown a barrel. The real possibility, is that the action may be positioned slightly different than before cleaning. Take it out and reseat it. Bedding can make a big difference and will keep that from happening again.  There is also the possibility that your rifle likes to have a fouled bore. Have seen that a time or two.