A friend is scrapping some old cast iron drain pipe, the kind with oakum and cast lead joints. Has anybody here ever used that for casting bullets? Is there some standard lead/tin alloy used for pipe joints, or was it pure, or was it whatever came to hand? I just read that it takes 3-4 pounds per joint, which is a reasonable amount of shooting for a few whacks of a sledge. That is, if the stuff is usable for round balls.