Good luck, the first thing you'll find out about owning a .50 is that everything is expensive. The next is that people that own them are cheap! Probably due to the fact that everyone is trying to gouge them.
If you want to make bullets, use a CNC lathe to make solids out of brass as they're the best and that's been proven in matches. Next would be the Hornady AMAX line of bullets.
I wouldn't waste my time on those tracer projos, how are you going to get consistent amounts of lead in each one to keep them stable? Never gonna happen and you be out all that money trying to do it.
Look into Corbin, they make all the stuff you'll need to make your own bullets. They also sell all the components that you'll need but it's not cheap to do it right, one of their hydraulic presses is the way to go. Again it's not cheap and you'll need a lot to make your money back.
That comes back to price, if they're to expensive you won't sell any or to few to make your money back. Think $2 each or less or you won't sell very many and your business venture will die before it gets off the ground.
The thing that's always bothered me was the fact that people think that just because you own a .50 you have all kinds of money to spend on anything for the .50! Making bullets for just the .50 is not a get rich kinda scheme, if it was it would've already happened for a few people.
Anyway, good luck on your venture and if you get it going come by the 50 forum on ar15.com and post there.