Some will shoot it and some won't. I won't shoot powdery lead bullets as long as I can afford something better.
Here's a post I saved from BenchrestCentral:
Lead Oxide Pb3O4, the white stuff on you car battery thermals
Melting point 800 degs. F
Hardness: 4-5 mohs hardness scale
Aluminum Oxide Al7O3, abrasive
Melting point 2073 degs. F
Hardness: 9 mohs hardness scale
The difference is in the crystal lattice structure and the upset along the shear plans within the lattice structure. Aluminum oxide as a hexagonal structure, lead oxide has blocky crystals terminated by a blunt four sided or complex pyramid!
Now YOU know!
Will