[CherokeeT]

Duracast is a commercial cast bullet company. Their alloy is probably hard, typlical of commercial CB sellers. As for leading, fit is king to prevent leading, meaning the bullet size in relation to barrel rifling size should be .001-.002 larger. For revolvers, the bullets should be the same size as the chamber throats which hopefully are larger then the barrel rifling size. Bullets should also have a good lube. The only way you are going to know if they lead is try them. A copper choreboy pad (make sure its copper) will easily remove any leading in the rifling; just wrap some strands around a brush and go to it.