Okay, thanks.

I find that bullets do not have to be concrete-hard to avoid leading. In fact, to a point, softer bullets do better. To maximize velocity without accuracy-destroying blow-by, you have to have the correct combination of alloy, lube, bullet dimensions, and choice of powder.

That said, it's hard to generalize. As Taffin said, "Every gun is a law unto itself."

-AaronB