how long does it take to get the double ammo mould osrs at 35 smithing

July 7, 2026

It typically takes around 75–90 minutes of Giants’ Foundry gameplay to unlock the double ammo mould, assuming you play reasonably efficiently at around level 35 Smithing and have Dwarf Cannon done.

Quick Scoop (Core Answer)

The double ammo mould is bought from the Giants’ Foundry reward shop for 2,000 Foundry Reputation , and you must have completed Dwarf Cannon.

Testing and wiki data suggest ~75 minutes on average using optimal sword moulds; with worse setups, it can stretch closer to 90 minutes for most players.

At 35 Smithing , you can already use Giants’ Foundry, but your XP and rep are slightly lower than at higher levels, so expect to be near the upper end of that 75–90 minute window.

So, if you go in focused and don’t constantly mis-heat or over-fill swords, you’re realistically looking at about an hour and a half of Foundry runs to get the mould.

How Giants’ Foundry Rep Works (Simple Story Version)

Think of Giants’ Foundry like a mini-game where you’re a factory worker smashing out custom swords for Kovac. The better you follow his specs, the more Reputation you earn per sword, which you then spend in the reward shop.

Each sword gives:
- Smithing XP (scaled by how well you match the commission).
- Foundry Reputation (your currency for rewards like the double ammo mould).

At higher Smithing levels, you:

Make higher-tier swords more easily.
Hit better quality scores more consistently.
Slightly increase your rep per hour , which is why the wiki’s “75 minutes” estimate assumes players can use Steel–Mithril longswords with optimal moulds (up to 81 Smithing).

At 35 Smithing , you:

Are on the lower end, so you’ll lean on steel swords and simpler mould combos , which are still fine, just not maximum efficiency.

In practical terms, that just nudges you closer to 90 minutes rather than 75.

Time Breakdown At 35 Smithing

Here’s a rough, simplified breakdown based on the wiki estimate and typical Foundry behavior.

Target: 2,000 Reputation for the double ammo mould.

Rep per sword at low–mid levels: Often in the 60–90 rep per run range if you’re doing decently but not perfectly.
Swords needed: Roughly 22–30 swords depending on your quality and mould setup.
Time per run: About 3–4 minutes once you understand the mechanics.

That gives something like:

25 swords × 3.5 minutes ≈ 87.5 minutes , which fits the 75–90 minute ballpark.

If you:

Learn your mould combos,
Avoid overheating or underheating too often, and
Don’t idle between steps,

you can stay closer to the 75–80 minute mark even at 35 Smithing.

Why People Want the Double Ammo Mould

Once you have it, the double ammo mould is a big quality-of-life boost if you do a lot of cannonball smithing:

It uses two steel bars per interaction and produces 8 cannonballs every 8 game ticks (4.8 seconds) instead of 4 cannonballs per bar with the regular mould.

In practice, this almost doubles your profit and XP per hour compared to a regular ammo mould, at the cost of slightly less AFK time per trip.

For players who:

Park at a furnace and grind cannonballs,
Or use things like the Ancient Furnace / new Sailing content,

the double ammo mould is basically the “turbo” option for your cannonball method.

Mini FAQ

Do I need high Smithing for it?

No: you only need access to Giants’ Foundry , and 35 Smithing is enough to participate.
Higher Smithing just makes the 75-minute wiki estimate more reliable; at 35 you should still be very close, but allow extra time if you make mistakes or use weaker moulds.

Is it worth grinding early?

If you plan to make a lot of cannonballs (Ironman, Slayer cannon enjoyer, or GP-focused skiller), then yes , grabbing it early is very worthwhile because it permanently improves your cannonball rate.

If you rarely use a cannon, you can delay the grind until later, when your Smithing and Foundry efficiency are higher.

Information gathered from public forums or data available on the internet and portrayed here.