Mithril cannonball
“Ammo suited for a boat's cannon.”
MembersTradeable (not for Ironmen)High alch 36 gp
Sources from the OSRS Wiki's drop, shop and recipe data (CC BY-NC-SA 3.0), checked 2026-10-09; the verdict and ordering are ours, built from that data. Item sprite © Jagex.
Ironman verdict
Mithril cannonball is a members item. Other players trade it, but an Ironman cannot use the Grand Exchange or trade, so you get your own. We list 3 monsters, 1 shop, 2 recipes and 8 other sources for it.
The easiest way is to buy it from Port Roberts Cannonball Stall in Port Roberts, at 150 coins each. You can also make it with 55 Smithing from Mithril bar at a furnace. Each one made gives 34 Smithing XP. That is the lowest-level of its 2 recipes. If you would rather kill for it, the lowest-level monster that drops it is Hammerhead shark (level 90), at 4/100, about one in 25 kills. The best rate is from Gryphon (level 95): 6/128, 8–12 at a time. The 3 monsters we list with a combat level range from level 90 to 209. It also comes from 8 other sources, such as Plundered salvage and Large salvage.
The material you can buy or make: Mithril bar, made with 50 Smithing.
The shop that stocks it is in Port Roberts.
It is a material in 2 recipes: Mithril chainshot cannonball (55 Smithing) and Mithril incendiary cannonball (55 Smithing). High Alchemy (55 Magic) turns one into 36 coins. Each cast uses a nature rune, 180 coins from a rune shop, and five fire runes that a fire staff replaces, so an alch loses about 144 coins; only alch it to clear space.
Where to get it, easiest first
- 1.Buy atPort Roberts Cannonball Stall · 150 coins each in Port Roberts, 8000 in stock at a time
- 2.Make fromMithril bar · needs 55 Smithing at a furnace
- 3.Make from2 × Mithril bar · needs 55 Smithing at a furnace
- 4.KillHammerhead shark · level 90, drops 48–60 at 4/100 (about one in 25 kills)
- 5.KillGryphon · level 95, drops 8–12 at 6/128 (about one in 21 kills)
- 6.KillDire gryphon · level 209, drops 8–12 at 6/128 (about one in 21 kills)
- 7.Earn fromPlundered salvage · another source in the game
- 8.Earn fromLarge salvage · another source in the game
- 9.Earn fromCannonball stall · another source in the game
Our order: buying first, then making it (lowest skill level first), then killing for it (lowest-level monster first), then other sources. Up to three of each; the full lists are below.
Monster drops
| Dropped by | Level | Quantity | Rarity |
|---|---|---|---|
| Hammerhead sharkEasiest | 90 | 48–60 | 4/100 |
| Dire gryphon | 209 | 8–12 | 6/128 |
| Gryphon | 95 | 8–12 | 6/128 |
Best rates first, plus the lowest-level monsters that drop it.
Make it yourself
Shops
- Port Roberts Cannonball Stall150 coins · stock 8000
Other sources
- Plundered salvage
- Large salvage
- Cannonball stall
- Tarnished chest
- Reinforced chest
- Tiny port reward bag
- Small port reward bag
- Medium port reward bag
Minigames, reward chests, clues, skilling and other non-combat sources.
Used to make (2)
2 recipes use Mithril cannonball as a material, lowest level first.
- Mithril chainshot cannonball2 used · 55 Smithing
- Mithril incendiary cannonball2 used · 55 Smithing
Related items
Also sold at Port Roberts Cannonball Stall
Also dropped by Hammerhead shark
What it is made from
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