Shots kinda an expensive proposition for casting alloy as it`s more pricey than ingots & it`ll likely need some tin/lino added as it`s not likely to be magnum chilled .
But pushed into a corner as it looks as if we casters are lookin at any source is gonna be a good source !!!
I`d certainly clean it up in a seperate smelting pot & don`t be suprised at the temp ya gotta get it to melt it as the coating on it acts like an insulator & don`t add cold wet shot to a melt !!!