It's all in the hardness of the bullet. So many guys cast relatively hard bullets believing they are needed for the prevention of leading and for accuracy. Sometimes that is the case, but not most of the time. Bullet fit is waaay more important. If the bullet fits the throat (.0005" less than throat diameter) and not groove diameter, and is sufficiently well lubed, astonishingly soft alloys can be used- as a rule. A soft alloy RN will expand plenty in tissue. Not quite as well as a FN, but plenty good enough.
