Re: Copper streaks with new barrel
I believe that those streaks may or may not be significant. How is the barrel shooting is the primary concern. How easy is it to clean, other than getting rid of that discoloration?
We usually do not expect top accuracy until up to 200 rounds have been through a barrel, sometimes more, sometimes less. Some barrel makers cringe when they hear about all the cleaning during break-in (and after) that is being done, nasty potential for wear.
Some of our barrels (Lilja, Hart, Rock, Pac Nor, Shilen) show what some guys call copper wash. What the hell that is I don't care, I can't get it out and the barrel drives tacks.
Guess my point is that some of these things are not as big a concern as we tend to make them. If the barrel is fouled you will see a LOT of copper discoloration at the muzzle and probably a loss of accurace. You will also get lots of blue and blue/green discoloration on your patches when you use a strong copper solvent. When that diminishes to virtually not visible on a patch, you should have succeeded in getting rid of the copper fouling.
There are guys here who have much more experience than I do but I just don't worry about that faint discoloration, particularly if the barrel is shooting well. Also I stick with one brand of cleaning solvents (carbon and copper) and the same brand for oil and rust prevent, and one basic cleaning routine. This ain't brain surgery, you just have to let the chemicals do the job.