|Inputs (189,000)||Outputs (395,280)|
|540 × Steel bar (189,000)||2,160 × Cannonball (395,280)|
After completion of Dwarf Cannon, players can smith cannonballs, which is profitable since one steel bar at 350 coins produces four cannonballs worth 732 coins total, thus 382 coins profit. Depending on which furnace the player chooses, one can produce between 2160 and 2400 cannonballs in an hour. That means the profit margin falls between 206,280 and 229,200 hourly.
Edgeville furnace is the closest furnace to a bank which has no requirements. The Prifddinas furnace is the closest to a bank but this requires the completion of Song of the Elves. Shilo Village is the second closest to a bank but players must pay 20 coins to use it.
It is strongly recommended to check the live prices on the Grand Exchange before making large investments in any method.
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