I bought a used Ruger No. 1 varmint model in 22-250 and am having trouble getting the patches to come out clean. It does not appear to have a copper fouling problem (no blue colors on the patches) but no matter how much I scrub with a brass brush and solvent soaked patches - I still get gray colors on the patches. I've used both Hoppes #9 and Shooters choice solvents plus a couple of sessions with non-imbedding type JB bore cleaner. I have not shot the gun yet because I wanted to start with a clean bore - still not there yet! The rifle is in excellent shape and does not appear to have been used a lot - just cleaned less than it was used. Any suggestions would be appreciated.