I break the gun down about every other trip but do a nominal cleaning after every trip, this time on breakdown and cleaning I noticed a brownish substance in the barrel. I use Hoppe's #9 and a brush and patches, I don't have a boresnake(or plans to get one) My question is: This stuff only appears to be in the grooves not on the lands so I am sort of ruling out rust, is it more likely this is copper fouling? I have only shot FMJ roundnoses to this point so all copper plated. I thought the #9 would remove metal fouling, but doesn't seem like it has, do I need a tighter fitting patch or a different cleaner anyone can recommend? Am I right in ruling the rust out? Any help is appreciated. I store my .22 revolver i the same location and the barrel in that is a-ok but it doesn't get much of a copper diet unless I'm shooting the mag cylinder so that also factors into my thinking it's not rust in the .45.