I read (and has been commented on the forum here a bit) about the last lead smelting plant closing in the US and someone mentioned that the price of copper is pretty high, more expensive than lead anyway, and so you might expect bullet costs to go up in the future.
There are the all copper hunting bullets like the Barnes stuff which still expands like lead.
Is cost the main reason they were using lead in the past? Is copper a better bullet, but more expensive?