I do a general break in process with factory barrels.
I used to clean to bare metal after every range trip. I stopped, mainly because my Chrony showed the slower shot with clean bore, and I switched to hex boron bullet coatings.
What convinced me that I'm cleaning to much is a old Savage 7mag. I would work up a load and get awful groups. I did this for several load work ups and never did find a good load. So I ordered a 300 win mag barrel and was going to scrap the 7mag.
I figured, what the hell.... I'm going to try something before I switch.
I loaded 100 cases of a load that was giving me 1moa groups and just shot them. Around 50 or so rounds the load started tightening up, by the time I got to 80 rounds, this sporter barrel was putting three in one hole... I haven't touched it yet, and it's around 200 rounds with out cleaning. The load is a little slow but so accurate that I just kept the load for now..