KG-12 Big Bore Cleaner just did it better! I used to swear that the best copper remover was Sweet's until this morning. I bought some KG-12 to try and used it on my SPS-T that I "knew" was clean and 6 nasty patches came out of the bore. I then decided to swab the bores on the rest of my rifles and sure enough, there was residual copper in each one. I thought I was a very meticulous individual when it came to cleaning my firearms, I guess it's time to ramp up my OCD and do it right the FIRST time! You guys need to try this stuff, it's amazing!