Cannonball
Smithing1 steel bar → 4 cannonballs for 25.6 Smithing XP (ammo mould). ~2,400 balls/hr (600 bars) with a single mould, ~4,800/hr (1,200 bars) with the double ammo mould — same 1:4 ratio, so set the bars/hr above to match your mould. Requires Smithing 35 + Dwarf Cannon.
Smithing XP / hr15,360
Profit / hr275.4k
Profit / XP+17.93
Materials / hr
 Steel bar | 600 | 557 | −334.2k |
Produces / hr (expected)
2,400609,600
Value / hr: 609,600
Profit and XP shown per hour at the rate above (edit it to match your play). Prices are live from the Grand Exchange.