I guess its fair to say "don't get your shorts in a bunch" over it. BB, CB, Shorts, longs and long rifles seem to work just fine. Long ago I was considering tossing out my "tornado" stainless steel brush because I feared for the chambers and rifling. But its really nothing to fear if you only use it in the chamber area. I have no idea if those are still available or not, but they were loops instead of individual bristles. The idea was they'd scrub the lead and hard powder fouling right out.
I don't even understand why I was afraid of it, since I shot LRs almost all the time. I always thought the bath tub ring I saw in chambers was lead, but I really don't know what the hard ring was made of. I know there were times when it took a lot of brushing to get rid of it, and then it might come back the next time I went shooting. I sure wish someone smart would step in here and explain what it is.