Granite cannonballs are enhanced cannonballs created by using a regular cannonball on granite dust. This requires 50 Smithing and gives no experience.
These cannonballs increase the max hit of the dwarf multicannon from 30 to 35, equating to an approximate damage per second increase of 15%.
When a player creates granite cannonballs, a message in the chatbox will state You apply a thick coating of granite dust to your cannonballs.
If a player is killed by another player in the Wilderness or a PvP world, the killer will receive regular cannonballs.