Numbers are per bullet.
Strata 1:
Normal attack: 6-8
Charge attack: 10-13
Strata 2:
Normal attack: 10-11
Charge attack: 16-17
Strata 3:
Normal attack: 18-19
Charge attack: 29-31
Strata 4:
Normal attack: 20-21
Charge attack: 32-34
Strata 5:
Normal attack: 38-39
Charge attack: 64-72
Strata 6:
Normal attack: 39-46
Charge attack: 72-79
Unlike the wiki I am not including Fire damage. This is because I tested it on several different enemies per floor and found that they have different resistance to status, even within the same family. For example Strata 3, D19 Arena gave me Wolvers, Slimes, Gremlins, and Chromalisks. Chromalisks took 16 from Fire, while the Wolvers (and Alpha Wolvers) took 19. Gremlins took 14. I am not testing the weapon against literally every enemy type, and I am not putting up incorrect data so no numbers for Fire.
~Gwen
FYI, monsters' defense against fire damage can be classified into 6 groups.
Fire damage done by a volcanic pepperbox in Tiers 1 & 2 are the same as firotech, firotech mk II, & pepperbox.
(The fire damage for these 3 guns start to decrease from depth 19 onwards.)
Except for Ice Cubes, Quicksilvers & Toxigels, "themed" monsters take the same amount of fire damage as the "normal" versions.
(Fire themed enemies being an exception since they are immune to being set on fire.)
Also, Fire (and other status damage) are not affected by the "heat" of the weapon.
The fire damage done by a level 1 Firotech Alchemer is exactly the same as the fire damage done by a level 10 Firotech Alchemer.