Have you bought any ammo recently and if so, how does the price compare to what you paid for the same ammo 2 years ago?
Yes, and it's MUCH more expensive and availability spotty.
But it doesn't have anything to do with whether we mine and smelt lead in the US, and very little to do with the price and availability of lead.
A good bullet cots 40-50 cents each. A good rifle cartridge costs "about" a dollar.
The price of lead would contribute about 5%.
And there are thousands of tons available.