Mithril cannonball
Ammo suited for a boat's cannon.
149gp
135gp
14gp
+12gp
—
—
Price history
1 points · hover for detail
Volume · units traded
- 30D low
- 135
- 30D high
- 149
- Volatility
- 9.9%
Flip calculator
Includes the 2% Grand Exchange tax
+12gp
+12 per item · +8.89% ROI
- Capital required
- 135 gp
- Gross revenue
- 149 gp
- GE tax (2%, 2/item)
- − 2 gp
- Break-even sell
- 137 gp
Item data
- High alchemy
- 36 gp75.8% below market
- Low alchemy
- 24 gp
- Shop value
- 90 gp
- Weight
- 0 kg
- Skill / type
- Smithing
- Stack / note
- Not stackable · not noteable
- Released
- Nov 19, 2025
About Mithril cannonball
The Mithril cannonball is a members-only item in Old School RuneScape.
"Ammo suited for a boat's cannon"
Over the last 30 days it traded between 133 and 160 gp on the Grand Exchange, averaging 145 gp. About 482,537 units changed hands per day. The price is down 6.1% across that window. The Grand Exchange buy limit is 11,000 every 4 hours. Selling one at the average price costs 2 gp in Grand Exchange tax.
Casting High Level Alchemy returns 36 gp, which is 75.2% below the 30-day average price, so alching a bought one loses money.
How to get Mithril cannonball
12 monsters drop Mithril cannonball, most commonly Cannonball stall (24/256), Plundered salvage (50/1,036) and Dire gryphon (6/128). Only Port Roberts Cannonball Stall sells it.
Dropped by
| Monster | Rarity | Quantity |
|---|---|---|
| Cannonball stall | 24/256 | 1 |
| Plundered salvage | 50/1,036 | 2–5 |
| Dire gryphon | 6/128 | 8–12 |
| Gryphon | 6/128 | 8–12 |
| Hammerhead shark | 4/100 | 48–60 |
| Reinforced chest | 2/60 | 5–10 |
| Large salvage | 50/2,218 | 2–5 |
| Tarnished chest | 1/60 | 5–10 |
| Large port reward bag | Unknown | 49–58 |
| Medium port reward bag | Unknown | 40–59 |
| Small port reward bag | Unknown | 40 |
| Tiny port reward bag | Unknown | 44–54 |
Sold in shops
| Shop | Price | Stock |
|---|---|---|
| Port Roberts Cannonball Stall | 150 gp | 8000 |
Mithril cannonball price history
Daily averages rolled up per month, newest first.
| Month | Average | Low | High | Volume |
|---|---|---|---|---|
| October 202612d | 142 | 133 | 151 | 6,286,296 |
| September 2026 | 149 | 137 | 160 | 13,179,019 |
| August 2026 | 150 | 142 | 167 | 19,145,659 |
| July 2026 | 149 | 138 | 156 | 26,277,350 |
| June 202621d | 155 | 149 | 160 | 17,729,608 |
| May 20262d | 154 | 154 | 154 | 927,936 |
| April 20261d | 149 | 149 | 149 | 342,530 |
| March 2026 | 152 | 137 | 161 | 11,938,368 |
| February 2026 | 161 | 156 | 172 | 1,560,686 |
| January 2026 | 187 | 154 | 251 | 17,856 |
Across 10 months of recorded prices Mithril cannonball ranged from 133 gp in October 2026 to 251 gp in January 2026, measured over 218 trading days.
The 30-day average of 145 gp sits in the lower third of that range.
All prices in gp. Volume counts units traded across both sides of the Grand Exchange.
