Steel cannonball

“Ammo suited for a boat's cannon or for a dwarf multicannon.”

MembersTradeable (not for Ironmen)High alch 3 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

Steel 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 9 monsters, 2 recipes and 8 other sources for it.

You can make it yourself with 35 Smithing from Steel bar at a furnace. Each one made gives 25.6 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 Killerwatt (level 55), at 2/140, about one in 70 kills. The best rate is from Juvenile custodian stalker (level 93): 20/160, 10–15 at a time. The 8 monsters we list with a combat level range from level 55 to 785. It also comes from 8 other sources, such as Nex and Frozen cache.

The material you can buy or make: Steel bar, made with 30 Smithing.

Bosses we cover that drop it: Corporeal Beast, Phantom Muspah, The Hueycoatl and Doom of Mokhaiotl.

It is a material in 3 recipes: Steel chainshot cannonball (35 Smithing), Steel incendiary cannonball (35 Smithing) and Granite cannonball (50 Smithing). High Alchemy (55 Magic) turns one into 3 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 177 coins; only alch it to clear space.

Where to get it, easiest first

1.Make fromSteel bar · needs 35 Smithing at a furnace
2.Make from2 × Steel bar · needs 35 Smithing at a furnace
3.KillKillerwatt · level 55, drops 3 at 2/140 (about one in 70 kills)
4.KillBull shark · level 65, drops 48–60 at 4/100 (about one in 25 kills)
5.KillJuvenile custodian stalker · level 93, drops 10–15 at 20/160 (about one in 8 kills)
6.Earn fromNex · a boss drop
7.Earn fromFrozen cache · another source in the game
8.Earn fromRusty chest · 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
Corporeal Beast	785	2000	17/512
Phantom Muspah	741	670	5/235
The Hueycoatl	642	60–1200	3/68
Doom of Mokhaiotl	—	200–600	5/104
Callisto	470	600	4/126
Venenatis	464	600	4/126
KillerwattEasiest	55	3	2/140
Bull shark	65	48–60	4/100
Juvenile custodian stalker	93	10–15	20/160