For muzzle-loading, and therefore also for pistols/revolvers, I only use lead, often called "crapper" lead (old lead pipes, lead sheet) that has been melted down and purified, then made into ingots: this is soft lead. I'm thinking about whether I could use wheel-balancing lead. It's much harder, but, since the Pedersoli mold is made to cast bullets that are right at rifle caliber and don't need to be calibrated, it would be a possibility to save the good soft lead. I also have to say that I have over 150 lbs of this lead, which I only used when I still had two modern guns, and now that I no longer have any, I'll have to find a use for that lead...