There are 2 types of Brass. Yellow which is the softest, is the most common that is used in fishing products. And then there is Red brass which is much stronger, and is used more in things like pipe fittings. Both types easily tarnish in water. Many older spinning blades were made out of Brass. Most were nickel plated, but some sported the virgin Yellow Brass finish.
I am pretty sure that Brass, either type, would have a much higher melting point than lead. Whether or not your equipment/molds would hold up to the task would be my first concern. Cost may be another deterent.
I believe that Lead is heavier than Brass too, if I am not mistaken. If light is your goal for a bigger profiled head, then that would be a good thing. Maybe someone else has some better knowledge? I hope this helps you some.
<,"}/>{ Rippa