I also believe (and someone correct me if I am wrong) that brass corrodes easier when used with black powder. At least it seem that to me based on my old brass frame cap and ball I had many years ago. I know, steel will quickly rust from uncleaned black powder but I believe it was easier to clean up than that old brass frame was. That said, I have always liked the looks of a brass grip frame on a SA revolver. I remember years ago when Ruger offered it's Old Model Super Blackhawk (for a very short time) with a brass grip frame. It was the one to get as it gave the old war horse a totally different look. The only drawback I can see to the brass grip frame now is that it identifies with the early 'cheaper' Italian imports back when they did not have a good reputation for quality. As for me, I like 'em! 44 Man