If that's all the copper in your barrel it's not enough to matter. When it runs out in a blue river with "Wipe Out" then you have a problem.
I shoot my rifles with no cleaning other than a swab with old fashioned Hoppe's #9 after use. If the accuracy falls off then I look for more problems. More barrels are ruined by over cleaning than by shooting.
Consider the use most rifles get in a season. Unless you are a dedicated varmint shooter you are not going to use more than a box or two of ammo in a rifle in 5 years. Wipe it out, dry it and put it back inte safe. It'll be there next year.
I know there are those of you who burn through a case of 7.62 a week so this doesn't apply to you. I'm speaking to the average hunter of today or even my father's generation.
