What have we become
I don't want to live to see the day a government agency says we can't shoot lead out of our guns. Being a young man, intent on pursuing a career in firearms, seeing the United States head the direction we are in makes me doubt the security of my future. It scares the heck out of me folks. All I want to do is make guns and shoot them. Now it seems there are many people that want to take that away from me.
But to answer your question, I don't believe it's worth your time to save pennies. Not only would pure zinc bullets be a terrible product, but it would be a federal offense to melt down currency.
Love your country, question your government