Ok I have been reloading for a long time but just recently got into casting for my 9mm and 45acp. I have three loading manuals here and they all state lower powder charges for cast boolits than J-word bullets. This does not make sense to me. It would seem to me that a J-word bullet would create more pressure to swage into the bore than a cast boolit because of the copper jacket being harder than lead. Am I wrong? So my real question is, why is it that load data for cast boolits have published lower powder charges than there J-word equivalent?