| Copper Fouling definitely degrades the accuracy of your
gun barrel. Getting the copper out the traditional way with gun
solvent, patches, brushes, (and a lot of scrubbing) is too time
consuming for most shooters... and it's a lot of dull physical
effort. Here are the methods we use why we use them the way we
USP Bore Paste - Bullet manufacturer's sometimes use different bullet jacket metal alloys that may not dissolve with the copper solvent you're used to using. We found this out when a few customers reported that our most aggressive copper solvent (KG-12) wasn't getting the copper out of their barrel. We contacted the folks at KG and sure enough, the copper from Berger Bullets doesn't dissolve in KG-12... Go figure! So, in those customer's barrels, we used USP Bore paste and it scrubbed the copper out easily and quickly. Read more at our USP Bore Paste Page.
KG-12 Copper Remover - We discovered this stuff when we had a couple of T/C Encore barrels in 204 Ruger that were coppering up so fast you couldn't do a decent break-in process. The coppering on these was so heavy from as little as 5 shots, they would take all night soaking in Bore Foam to clean it out. The KG-12 was developed for cleaning heavy copper from military Howitzer barrels... On these 204s, it cleaned out the copper in 15 minutes. Between KG-12 cleanings, we also polished these bores with KG-2 Bore Polish. These two barrels were beyond what a customer could fix with typical break-in procedures*. But using the KG-12/KG-2 process for cleaning during break-in really saved these barrels. About 1-2 hours of break-in and these barrels were shooting 1/4-1/2" groups consistently. The KG line of gun care products is very effective and worth checkling out. See our KG Systems Home Page.
(* We are continuing to evolve our recommended Break-In procedure... See our Barrel Break-In How-To Page)
Here's an Example - A customer brought in a World War II Nagant rifle a few months back. We foamed the bore for an hour and ran a patch through... it came out purple, there was so much copper fouling. We foamed it for another hour and the same thing happened. A look down the barrel and copper residue had lifted to give a furry appearance. So we ran a brush back and forth with Butch's to break up the loose copper. Then we ran a patch through to clean out the residue. We foamed it with Wipe-Out and left it overnight. Next day a clean patch came through purple again. We foamed overnight again and a clean patch came through light purple. One more Wipe-Out foam treatment and we had patches coming through clean. However, a look down the bore showed some copper streaking was still there. That's when a few patches of Butch's Bore Shine did the trick to finish the job. This was an extreme case of copper fouling in a 60-70 year old rifle with decades of copper fouling and pitting. Cleaning out the copper with traditional methods would have taken a tremendous amount of work. Using Wipe-Out and Butch's Bore Foam got it all out with almost no effort... and just a little patience to let the cleaners do the work.
Finish with Clenzoil - Once you've got the copper out, run a patch down the bore with some Clenzoil on it. Clenzoil is a lubricant and cleaner in its own right. But also, it tends to give the barrel and ability to resist fouling..