Wipe-out Patch out

I am in the middle of cleaning the barrel of my oldest M305. It has never seen a copper removing cleaner in its lifetime. I wrapped a patch soaked in patch out around a 22 cal nylon brush and run it through. It came out thoroughly blue the first time. I have soaked it for a couple of hours now, and the patches are getting less blue. I will put more patch out through before I go to bed and let it soak overnight. Its getting copper out for sure. Whether that impact accuracy or not, is to be seen. I have used this gun in several rapid fire competitions, shooting a lot of rounds through it in only 5 minutes. That should accumulate copper I would think.
 
the problem with copper deposits in steel barrels as I see it (the engineer way) it that should the bore be exposed to electrolytes (moisture with salts like unburned powder residue) then the iron corrodes to "protect" the copper
we use zinc plates to protect marine steel structures.
zinc has a lower potential than iron so it corrodes "protecting" the iron while copper has a higher potential.
 
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