I have a .25-06 AI that wont patch clean! Im using sweets 7.62 letting it sit for 10mins then patch dry. No matter how long I continue this even with scrubbing with a bronze brush it always comes out blue.
Why would there be so much copper in the barrel? pitted?
Depends on quality of the barrel. In general, factory barrels blue more and for a longer period than most custom barrels. Get a can of Wipe Out, follow directions and you may be amazed at the result. You may need to do this twice. Bluing means some roughness in the bore is retaining particles of jacket material. You might want to consider Tubbs bore lapping system.
I'll bet the barrel is pitted or perhaps someone neglected to clean it for a LONG time. I'd also recommend Wipe Out. It might take several days but it will clean your barrel eventually. I put it in and leave it in for at least 30 to 45 minutes and, when I go to bet, it stays in overnight.
Once you get the barrel real clean, shoot it and if it promptly fouls up again and is hard to clean, I would say your problem is a pitted or rough barrel. The solution would be a new barrel.
Also, take a light and look down the barrel after cleaning. It should look completely bright, shiny and smooth with no projections. If there is junk in the barrel after cleaning, it means there are rough spots that are catching little hunks of your cleaning patches.
I have a few factory rifles that are extremely accurate but seem to have very rough bores that take much longer to clean. Agree with previous post about Wipe Out. One squirt, wait 10 minutes run a patch to get the heavy carbon and most copper. Second squirt, wait a few hours and the copper is gone. With these rough bores Sweets takes forever to clean and can etch the bore if left too long. I have found that a lot of copper solvents will not clean carbon when used alone. Need to supplement with a carbon solvent.