"Wiki doesn't say..."

http://wiki.spiralknights.com/Abilities
"Each level of bonus adds an average of 7% extra damage."

Grab a calculator and try again.

Unfortunately, a lot of that data needs recollecting, since after the buff to gun and bomb damage last year, I suspect that many of the values are no longer accurate - I'm not sure if all of them got updated.

Before you go updating any information, though, please do make sure that you're not wearing any equipment that gives damage bonuses for the weapon you're gathering data on, that the weapon is fully heated, and that it doesn't have any vs. family UVs, because that can mess with the results.
Seem to recall Bopp mentioning that the Guild Training Hall results give the damage values for where the Clockwork Terminal would be at that tier.
EDIT: The training halls are at depths 1, 13, and 23 respectively.

It's also worth noting that certain 'heavy' monsters from the families (Trojans, Deadnaughts, Alpha Wolvers, Lichen Colonies and suchlike) may have lower damage values than the rest of the family; it's also possible to encounter a different tier or stratum's version of monsters (t3 Blast Cubes or Jelly Cubes in RJP, or the Danger Rooms, for example). I'm reasonably certain that you shouldn't bother getting values from either of these... unless you're some kind of masochist.

Rabeet-Ahsan: Yes, these numbers do take a while to collect. Thanks for appreciating that. :)

Aureate: It is true that many damage numbers throughout the wiki have not been updated since the May buff --- but not the Lancer Knightz data. The guild (with some help from me) collected all of these damage data just in the past few months.

Is not! I'm a Valiance user, and it's one of the best darn guns I've ever had the pleasure of using. Its shots are fast, deal enough KB to keep enemies at range (where guns are strongest) and does enough damage to keep me interested. Polaris still takes the cake for general purpose utility, but sometimes it deals too much KB at range and too little up close, plus it can blind party members. Blitz Needle does great damage, but has to be used up close, where swords would be safer, and immobilizes you for too long. Blitz is a good weapon, but not on par with Valiance or Polaris for utility and safety. I've never used the Umbra Driver, so I won't diss it.

Don't diss the Valiance. It's the trustiest gun this side of Cradle.

@Bopp I've collected some data for most of the guns in the T3 guild training hall in the past month, and I'm only missing the damage stats for the plague needle, iron slug, biohazard, and supernova. My stats seem be different from the Lancer Knightz (not sure if same depth or if things got buffed/nerfed) so I'd appreciate it if you could help add my data to the wiki.

@Comrad: Plague Needle damage stats in t3 ath, if you want them.
If there's anything else you need from that gun, let me know and I'd be happy to help out.

@conrade I do have a level 10 biohazard if you'd like damage numbers.

Also more people should use the GTH numbers for consistency's sake, since you have all enemy types and no dodging or unpredictable enemy behavior.

EDIT: whoops, looks like the numbers are already here:

http://forums.spiralknights.com/en/node/72662

Right, will do the Sentenza numbers as soon as I've got mine up to max heat. I'll try to get my hands on an Elite Trueshot Trinket at some point as well, just for completeness to have the max numbers.

-Normal damage weapons seem to benefit the greatest percentage wise from damage bonuses, but nonetheless are outclassed by specialized weapons (no surprise)
-Weapon damage bonuses seem to grow linearly - however, the autogun line (especially blitz needle) seems to scale its damage at a higher rate then most weapons (slightly overpowered?)

There are some very slight variations in how damage bonuses affect weapons, perhaps due to rounding errors. But Donkeyhaute and I have been analyzing the Lancer Knightz data at depths 19 and 24, and we have found each level of damage bonus to give consistently about 5% increase in damage.

Details: The Lancer Knightz data encompass damage bonus +0, +2, +4, and +6 on most of the 5-star swords, guns, and bombs. To understand how big of a jump each +2 damage bonus gives, we convert the data into (X, Y) pairs, where each Y is at +2 more damage bonus than the corresponding X. We fit a line of the form Y = M X to these pairs. The quality of this fit is very high --- every point lies very close to the fit line. The correlation coefficient is 0.999566, where 1 basically means "perfect fit". The best-fit slope M is 1.10167; thus each two levels of damage bonus give a 10.167% increase in damage. The square root of 1.10167 is 1.0496; thus each level of damage bonus gives a 4.96% increase.

No problem. I've done the same analysis to the raw damage numbers for Big Angry Bomb and Sun Shards "core and shard" that you linked. Using just the BAB and SS damage numbers, I get an extremely good fit with a resulting 5.39% increase in damage per level of damage bonus. That's slightly higher than what I got for other weapons, but pretty close, and very consistent. If I throw these numbers in with all of Lancer Knightz other numbers, then I again get an extremely good fit with a resulting 4.964% increase per level of damage bonus. So the data you linked are consistent with what I claimed above.

You are bringing in a new issue of DPS. DPS depends not just on the raw damage per hit, but also on how fast you can deliver those hits. If CTR/ASI does not affect all weapons equally, then a weapon that benefits a lot from CTR/ASI may overtake a weapon that doesn't benefit as much from CTR/ASI. Indeed, this is my experience: There is much more variation in how CTR/ASI affects weapons, than in how damage bonus affects weapons.

You don't want to compute the rate of increase by dividing the total percentage increase by 6. Instead, you want to compute the sixth root of the total increase ratio (because the effect seems to be multiplicative, not additive). So I get

BAB: 5.158% increase per level of damage bonus
Sun Shards/Crystal Bomb "core": 7.077%
Sun Shards "shard": 8.48%
Crystal Bomb "shard": 8.501%

In any event, you are right that these shard bombs are acting a bit differently from most other weapons. (The Lancer Knightz data don't yet include any shard bomb data.) Thanks for pointing this out! I'll look into it. I'll also examine whether my method of analysis is hiding any other special cases like this.

Yep, it's weird. Thanks again. I've seen some other weird things, when looking at various damage numbers. For example, Graviton Vortex's explosion does less damage in deep strata than in shallow strata?! We can spend a long time delving into these details. So please do (someone). I have plenty of projects going on already.

Comrade-Conrad: When I plot all of the Blitz Needle damage from depths 19 and 24, they lie pretty close to a line (correlation coefficient 0.999652) with a resulting 5.062% damage increase per level of damage bonus. But when I look at depth 24 in more detail, the increments seem to be as small as 4.101%. Hmm. About your other remark: People have tried to gather data on knights' health (the most recent example is here). I remember a thread about monster health a long time ago, but I'm not aware of any completed, thorough project on it. So please do it.

Everyone: There seems to be a sudden interest in gathering data about the game. That's great. I encourage everyone who's interested to read the Wiki Editors forum regularly. There's not much traffic there, but it's all about recording data and documenting the game.