bigcountry

First off, you got to have a good stiff one piece cleaning rod. Don't use three piece. Second, get you some Sweets. I always come back to it. CR10 is good but man its rough on a barrel. Rough on my dewey rods. Follwo the directions. Leave it in there too long, and it will rust the barrel. Very hydroscopic. With barrel burners like 300RUM's and stuff, it may take several 30 stroke scrub cycles to get it out. Rough barrels, might take an hour.

I follow it up with some decent break cleaner. I want all that stuff out.

Or,

I have been using wipeout with awesome results. It has an oil agent in there, so you can leave it in there for days and it won't draw moisture but will eat out copper. I first clean out powder with shooters choice, and then spray in wipeout, let it sit for 3 hours, come back and clean out and let it sit overnight. Usually thats all it takes.

Or,

Outers foul out copper removal tool. It does work.