Lloyd, I assume this would also apply to copper coated bullets..maybe that is plating...but several years ago when I spent several mths. in Oreg. I found a little gunshop with all kinds of neat bullets.. many hand cast...they shoot good, so they must have been done by someone who knew the score...in the same place I found cast bullets in .44 that were copper coated...they were cheap, the guy said they came out of an estate...so I bought like 500 or 1000, they are sitting in my loading room, I felt I could load them as cast, but wasn't sure...I remember when I saw Elmer the last time, he had some copper coated cast bullets......so from what I see here, my cast data will be fine...