Sounds as thoughthis was the first time you used a dedicated copper remover, so you have exposed the imperfections in the the bore by striping it down, therefor the need for some fouling shots to get things smooth again. Bare in mind hoppes, Shooter choice, etc slovents maysay they remove copper but not fully rather traces. You need a dedicated CR solvent which should be used after the powder/lead solvent. How those imperfections got there could be during manufacturering or even leaving the copper in the barrel to react and form pits. I don't agree with Brutal Attacks information and have always felt more harm comes from leaving copper unattended then by cleaning it. With proper tools and technique I see no problem with clean routinely (Ie proper tools:a bore guide, coated 1 piece rod, for caliber jags/brush and patches). Choice is yours.

My regiment is as follows andI haven't noticed any degrade in barrel life or accuracy b/c of it.

I clean after every range session which is usually a min of 20 shots. I start with Shooters Choice MC#7 saturated patches to remove lead and powder fouling. Follow with dry patches to remove the excess solvent. I then run saturated patches of Sweets 7.62 or Barnes CR 10 until the blue is no more, copper residue.(Follow the directions of your copper remover to the process suggested.) Once I have finishedI run a saturated patch of gun oil down the bore and store. Prior to firing I run 2 dry patches to remove any excess oil. For hunting season I don't touch the bore unless it will be sitting unused for extended periods,subjected to heavy moisture or seen a number of shots. Some of my rifles shoot great out of the hop and others like a little fouling so I let them dictate how they are come opening morning.

As mentioned JB bore paste via hand lapping may help, 50 strokes may work though you may require more so if you deceide to go this route take it slow and use caution as it removes metal being an abrasive! May be worth stripping it down and taking it to a gunsmith to have it bore scoped. They should be able to tell you if it shows reamer marks, pitting, etc and suggest a possible course of action.