I was talking to a friend yesterday about all things, ball bullets for the .50.
Back when we got into .50's, ball, AP, API... were about a dime each! Now that AP are coming to an end (haven't been made in US since WWII) the prices keep increasing. What's weird is that ball is going up also and it's still being made.
At one time another friend of ours had 20K brass projos made that looked like an M33 ball. Cost him about .50 cents each and he made his money back and then some. Right now you couldn't do the same thing, if you could I'd be all over it. Plus being turned solids they were far more accurate then the standard M33 projos made by swagging a jacket over a steel slug.
We also thought about cast/sintered bullets from scrap brass but even that probably won't cost less than doing it on a CNC machine. All of the machinist that I've talked to that need work some how find that it's going to cost them $2-5 each to just stand there and watch the bullets being made...