RuneScape Classic Wiki
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The main RuneScape Wiki has an article on: Multi cannon ball
The Old School RuneScape Wiki also has an article on Multi cannon ball.

Multi cannon balls can be made after completing the Dwarf Cannon quest. To make them, have a cannonball mould with you, and use a steel bar with a furnace. Every bar gives one cannonball. The cannonballs stack in the player inventory and are used as ammo for the Dwarf cannon. Cannonballs are 2x slower to smelt than normal bars.

Associated dialogue

Using a Steel bar on a furnace with no cannon ammo mould in the players inventory, quest progress is irrelevant

  • (you heat the steel bar)

Using a Steel bar on a furnace with a cannon ammo mould in the players inventory, after Dwarf Cannon quest

  • (you heat the steel bar into a liquid state)
  • (and pour it into your cannon ball mould)
  • (you then leave it to cool for a short while)
  • (it's very heavy)

Making multi cannon balls requires a smithing level of 35 and they give 25 experience.

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