I have the same issues with a few barrel burners. I suggest an abrasive cleaner like a JB polishing compound. It got the streaks out. I bet ya it will remove the streaks from the toughest barrels

Yes, copper can corrode and oxidize and pit a bore.

Have you tried Montana Extreme 50BMG? Very strong stuff. Also, how about JB bore paste? Then there's Wipeout. I've never had a bore not clean up well after using either 50BMG or Wipeout.

A little copper in the barrel won't hurt much of anything. But a lot can and usually does effect accuracy in some way.

BTW, as far as I understand, GM TEC is a carbon remover and does little or nothing for copper.

Try this site for some info on bore cleaning. You'll have to do some searching around to find it, but there's some great info there: www.6mmbr.com

Thanks for the info, Solitary, I have been doing guns for 30 years, but never payed much attention to the cleaning details, until recently.

It will only hurt the gun if you notice the accuracy declining. There are some experts that believe that "burnishing" the bore with copper is far superior to removing every speck of it. This is supposedly supposed to smooth over those imperfections in the barrel.

I personally don't know about that. To mehaving copper on copper in your barrel can only lead togalling.

I'm such a freak that I wouldn't be able to sleep util the thing was clean.

I wish I could tell you how to get it out. My gun has "burnished" lands near the end of the barrel and it still shoots sub 1" @ 200 yards.

I had another gun I was using for work that was super accurate and I removed all the copper out of it and it didn't shoot worth a crap until I'd put about 20 rounds through it.

So personally I don't worry about it. If the bore looks good and it's shooting good I leave it alone.

I use Sweets 7.62 as well. I've never tried CR-10, but Sweets gets crap out of the barrel that I haven't been able to remove with other solvents. The only thing I don't like about it is that it stinks to high heaven.

The electrical system is called Foul-Out. There are several versions made by Outers. Their cheapest one is about $90. It's not practical to use for regular cleaning, but I hear it does a good job on barrels with a lot of fouling. I have never used one.

I agree with many of the others about copper fouling. A little probably doesn't affect much, but a lot can cause problems. I try to get most of it out, but I don't get too worked up if I can't get it all.

Even with cr-10,it can talk a couple of hours to remove all of the copper from a badly fouled barrel.Just keep applying it over and over and eventually the copper will be gone.

Is the gun shooting badly? I know that in the magazines that I have read in years past this is one area that some swear by having thier barrel a bit fouled to maintain accuracy, and some swear by an ultra clean barrel to maintain peak accuracy. I am not sure which to believe since I just clean my guns after a couple of boxes of shells. More to keep them from rusting during storage than for accuracy. I dont know which solvent is best to get the copper out but I will wish you good luck on being able to get the rifle back to good condition.

No, the gun shoots good 1" groups conssitently, If its shooting that good, I'm not gonna worry about the copper streaks, I'll just clean the gun after shooting, with a good copper solvent.