Yesterday in preparation before slugging a friend's 45-70 Henry H010B with brass receiver, I slid my Teslong bore scope in the barrel to get an idea what it looked like. He has been shooting Precision-One trapdoor ammo that has what appears to be copper plated bullets. Although the copper fouling was far from bad I was going to clean it out. Then it occurred to me how do you keep the copper removing bore cleaners from getting on and messing up the shiny brass receiver (both inside and out). So I stopped right there.
I have zero experience with Henrys and am pretty close to clueless on how to proceed. This is a like new specimen and I have no desire to be the one who mucks it up.