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How to Get Heavy Caliber in Warframe (2026): Where It Drops, Stats and Is It Worth It
Increases primary weapon damage by 165% and increases spread by 2.97 at max rank
Last Updated on September 18, 2026
The short answer
Heavy Caliber is a rare rifle (primary) mod: Increases primary weapon damage by 165% and increases spread by 2.97 at max rank. Run Derelict Vault missions. Serration twice, at the cost of accuracy; it belongs on explosives and beams, not on snipers.
Reviewed September 13, 2026, current through Update 43.5. Stats are max rank from the live game data, drop chances from the official drop tables; this page is re-checked after every major patch.
| Mod facts | |
|---|---|
| Slot | Rifle (primary) |
| Rarity | Rare |
| Polarity | Madurai (V) |
| Drain at max rank | 16 (rank 10) |
| At max rank | +165% Damage; -55% Accuracy |
| Fastest route | Run Derelict Vault missions. |
| On our builds | 5 of 242 weapon pages |
Table of Contents
The card
Tap it to unfold the full card at max rank.
16
Heavy Caliber
Heavy Caliber
+165% Damage
-55% Accuracy
Rifle
Where it drops
Official drop table, best chance first.
| Where | Chance | Rarity |
|---|---|---|
| Derelict Vault | 4.17% | Rare |
Weapons we put it on
Heavy Caliber is in the recommended build on these guides; the tile opens the full build with every mod card.
Tips that save runs
- Serration on primary weapons for additive damage stacking
- Weapons with inherently low spread to mitigate the accuracy penalty
- Explosive weapons like Ogris where spread is less critical
- Damage bonus stacks additively with mods like Serration.
- Added spread is not affected by accuracy bonuses from mods like Twitch or Guided Ordnance.
Mistakes that waste runs
- Using it on shotguns, which it does not affect.
- Assuming accuracy mods will counteract its spread penalty.
- Ignoring the additional spread modifiers on certain weapons.