Heavy Caliber

Heavy Caliber
Tradeable
Untransmutable
Max Rank Description
+165% Damage -55% Accuracy
General Information
Type	Rifle
Polarity	Madurai
Rarity	Rare
Max Rank	10
Endo Required To Max	30,690
Credits Required To Max	1,482,327
Base Capacity Cost	6
Trading Tax	8,000
Introduced	Update 10.3 (2013-10-09)
Drop Table Sources
Missions Orokin Vault (Deimos)
Vendor Sources
Official Drop Tables
https://www.warframe.com/droptables

Heavy Caliber is a mod that increases damage of Primary Weapons (excluding Shotguns) at the cost of increased spread (reducing accuracy). Some weapons will have additional spread added, in addition to the base amount.

Stats

Rank	Damage	Spread	Cost
0	+15%	+0.27	6
1	+30%	+0.54	7
2	+45%	+0.81	8
3	+60%	+1.08	9
4	+75%	+1.35	10
5	+90%	+1.62	11
6	+105%	+1.89	12
7	+120%	+2.16	13
8	+135%	+2.43	14
9	+150%	+2.70	15
10	+165%	+2.97	16

Additional Spread Modifiers

Rank	Ogris	Miter	Flux Rifle	Dera	Synapse	Torid	Javlok	Ferrox	Scourge
0	+5	+1.36	+0.27	+0.9	+0.36	+3	+1.5	+1	+1.75
1	+10	+2.72	+0.54	+1.8	+0.72	+6	+3.0	+2	+3.50
2	+15	+4.08	+0.81	+2.7	+1.08	+9	+4.5	+3	+5.25
3	+20	+5.44	+1.08	+3.6	+1.44	+12	+6.0	+4	+7.00
4	+25	+6.80	+1.35	+4.5	+1.80	+15	+7.5	+5	+8.75
5	+30	+8.16	+1.62	+5.4	+2.16	+18	+9.0	+6	+10.50
6	+35	+9.52	+1.89	+6.3	+2.52	+21	+10.5	+7	+12.25
7	+40	+10.88	+2.16	+7.2	+2.88	+24	+12.0	+8	+14.00
8	+45	+12.24	+2.43	+8.1	+3.24	+27	+13.5	+9	+15.75
9	+50	+13.60	+2.70	+9.0	+3.60	+30	+15.0	+10	+17.50
10	+55	+14.96	+2.97	+9.9	+3.96	+33	+16.5	+11	+19.25

Notes

• Instead of reducing the accuracy by 5% per rank, each rank increases spread by a specific value per rank depending on the weapon. This effectively reduces accuracy but may reduce it by greater than 5% per rank (according to the Arsenal UI).
• Damage increase value of this mod stacks additively with that of  Serration to a total of +330% base damage.
  • Since the two stack additively and Heavy Caliber costs 2 more mod capacity for the same bonus, combining the two is slightly less efficient in terms of damage per capacity cost. Maxed Serration grants +11.79% bonus damage per 1 mod capacity, while maxed Heavy Caliber grants +10.31% bonus damage per mod capacity. Combining the two, Serration and Heavy Caliber grant +11% bonus damage per 1 mod capacity, which is +0.79% less bonus damage per capacity than Serration alone.
  • The bonus damage from using Heavy Caliber with Serration is double that of using Serration by itself, though it comes at the cost of an additional mod slot and Heavy Caliber's slightly higher "base" drain of 6.
    • For example, if base damage is 100 then Serration adds 165% bonus damage and Heavy Caliber adds an additional 165% bonus damage, for a total of 430 damage. Thus, bonus damage is doubled for roughly double (+114%) the drain cost.
• Accuracy reduction varies by weapon, even for those with 100 accuracy. For example,  Ogris (which has 100 accuracy, decreased to 1.7 at max rank) rockets fly very far outside of the reticle, while  Soma (which has 28.6 accuracy, decreased to 15.5 at max rank) spreads bullets considerably but do not stray too far from the reticle.
• The final accuracy after installing Heavy Caliber can be found by the following formula:

${\text{Resultant Accuracy}}={\frac {100}{(100/{\text{Base Accuracy}})+{\text{Spread Modifier}}+{\text{Additional Spread Modifier}}}}$

•  Guided Ordnance can counter the accuracy reduction.
• The following weapons are unaffected or barely affected by the accuracy penalty:
  •  Acceltra
  •  Aeolak (grenade mode)
  •  Amprex
  •  Basmu (Alternate Fire)
  •  Fulmin
  •  Flux Rifle
  • Primary-type  Gaze
  •  Glaxion ( Vandal)
  •  Ignis ( Wraith) (Helps somewhat due to a wider attack radius)
  •  Kuva Bramma
  •  Lenz
  •  Mutalist Quanta
  •  Opticor ( Vandal)
  •  Penta ( Secura)
  •  Proboscis Cernos
  •  Quanta ( Vandal) (Primary Fire)
  •  Stahlta (grenade mode)
  •  Synapse
  •  Tenet Envoy
  •  Tenet Tetra (grenade mode)
  •  Tonkor (when arming distance is reached) ( Kuva)
  • Primary-type  Vermisplicer (Helps somewhat due to a wider attack radius)
  •  Zarr ( Kuva) (Cannonball mode)

• While the center beam of all continuous weapons will noticeably wobble, they will stay within the reticle, making them more accurate than most other weapons.

Bug

• The accuracy stat in the mod's description uses the negative value of  Ogris' spread value as a percentage.

Trivia

• When it was first released, Heavy Caliber's original penalty was an increase in recoil as well as damage. However the recoil penalty did not affect recoil-less weapons ( Flux Rifle,  Ignis,  Synapse, bows and  Lanka among others), effectively acting as another instance of  Serration. This was confirmed to be unintentional in Warframe Prime Time - Episode 2 (9:40). The mod's penalty was changed in Update 10.4 (2013-10-16).

Gallery

Mod's effects prior to Update 10.4

Mod's appearance prior to Update 14

See Also

•  Magnum Force, the secondary equivalent.
•  Vicious Spread, the shotgun equivalent.

Media

Warframe Heavy Caliber After Update 10.4-0

Warframe Heavy Caliber mod

Patch History

Update 20.0 (2017-03-24)

• Fixed the Ferrox not being affected by Heavy Caliber.

Hotfix 19.4.1 (2016-12-16)

• Fixed extra stat appended to end of Heavy Caliber description.

Update 14.5 (2014-08-28)

• Fixed Mirage’s Hall of Mirrors not being affected by some mods (Heavy Caliber).

Hotfix 14.1.4 (2014-08-06)

• Fixed an issue with certain Mods (i.e Heavy Caliber) not working correctly with Hall of Mirror clones.

Update 12.3 (2014-02-27)

• Weapon and Mod conclave tweaks – increased the rating on the Heavy Caliber mod.

Update 10.4 (2013-10-16)

• Recoil penalty changed to accuracy penalty.

Update 10.3 (2013-10-09)

• Introduced along with Orokin Vaults.