To make a MUSKETBALLS it is needed a copper/iron bar (1 bar = 10 balls)
To make a GUNPOWDER need to have 1 coal and 1 saltpeter(new thing) 1+1 = 50g
-to produce saltpeter need to build a ctructure "saltpeter pile" (40 compost+40 lime+20 Hay = 40 pieces after 7 days)