I tried various methods over the years and have decided to just let the barrel tell me what it likes.
One of my most consistent cold bore hunting rifles had a bore so rough, it was green from the copper fouling. But 1st shot at any distance from zero to 800yds was dead on. Did this test over the 5yrs I had it and it never failed to hit.
I did clean it a few times and mined out the copper till it was clean. The worse was 16 shots to return to sub MOA. I guess I took out ALOT of copper.
Another barrel would literally destroy the bullets after firing no more then 17rds. Clean it, first shot in the group which was a dead reliable 1/2 min at 200yds until rd 17 then PUFF.
With the match barrels I am using and being particularly lazy, I just push a dry patch down the bore every 40 to 60rds. Two or three and the patches are a light grey. 1st shot is in the group and accuracy is maintained.
Every now and then, I get really guilty and chem clean the bore. Doesn't accomplish much more then the dry patch but I feel better.
I believe shooters clean way too much. If the groups are as desired and repeatable, leave it alone UNLESS corrosion is a potential problem.
If you have to clean, clean only enough to restore accuracy.
I read all too often and have done it myself. Clean til the bore is bare, then take a few fouling shots before shooting for accuracy.
What do you think the bore looks like after those fouling shots?
Jerry