Left 4 Dead 2 Weapon Damage...

Just a look into what damage the guns do to the tank on expert difficulty...



Pistols
45 seconds - fast dual pistols - 8 clips (slightly less than 8 clips)
63 seconds - dual pistols manually fired - 8 clips (slightly less than 8 clips) (one trial only)
63 seconds - magnum pistol - 13+ clips (1-2 shells into 14th clip) (one trial)
lotsa seconds - single pistol - 16 clips

Ranged* clips required:
dual pistols 8/blah
magnum
pistol

SMGs
35 seconds - silenced smg - 7 clips (slightly less than 7 clips)
45 seconds - smg - 9 clips (about 8.5 clips)

Assault Rifles
26 seconds - ak47 - 4th clip (more than half way into 4th clip)
31 seconds - assault rifle - 5 clips (slightly less than 5 clips)
33 seconds - triple-shot assault rifle - 3+ clips (second burst from 4th clip)

Sniper Rifles
31 seconds - military sniper rifle - 3 clips (59 rounds)
42 seconds - hunting rifle - 6 clips (59 rounds - same with head-shots)

Shotguns
25 seconds - combat shotgun - 4+ reloads (41=40 & 1 shell)
27 seconds - auto shotgun - 4+ reloads (41=40 & 1 shell)
46 seconds - pump shotgun - 4+ reloads (34=32 & 2 shells)
48 seconds - chrome shotgun - 4+ reloads (35=32 & 3shells)

Melee Weapons

10 swings - Machete (10 swings in 7 seconds)
10 swings - Frying Pan (8.5 seconds)
10 swings - Electric Guitar (8.5 seconds)
10 swings - Police Baton (6+ seconds)

(Editorial: More proof that melee weapons are meant to be noob-friendly)

Expert swings to Incap a Survivor with FF

15 hits - Frying Pan
15 hits - Electric Guitar
20 hits - Machete
20 hits - Tonfa (and it's VERY hard to hit a survivor with the Tonfa, between 6 and 24 extra swings were required to get 20 hits)

Swings to Kill other Infected
2 swings - charger (reported: 1 head hit)
1 swing - all other infected besides tank, witch (below) and charger

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CHANGED from Left 4 Dead 1 Campaign mode:

Fire and Weapon Damage COMBINE (like in Left 4 Dead Versus)
Fire SLOWS the Tank (like in Left 4 Dead Versus) (but a flaming tank can catch you if you're under 40 health)

Tank burn-to-death timers:
Difficulty - Time to Death (no gunfire)

Easy - 65 seconds
Normal - 70 seconds
Advanced - 75 seconds
Expert - 85 seconds

Waiting for the Tank to burn out is no longer an option.

Pipe Bombs, Oxygen Tanks, Propane Tanks stumble but
DO NOT HURT TANK AT ALL

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General Strength of Tanks (measured against normal difficulty)
Difficulty - Sniper Rifle Shots to Kill (Military or Hunting)

Easy - 34 shots (75% Normal)
Normal - 45 shots (100% Normal)
Advanced - 89 shots (200% Normal)
Expert - 89 shots (200% Normal)

Headshots did no extra damage (one trial - maybe saved 1 bullet)

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Witch Kills

4 Mellee Weapon strikes
12 Sniper Rifle hits (1st shot in head stuns)
(safest kill is now military sniper rifle from a long distance)
1 shotgun shell down through head into torso
2 shotgun shells into upper back
3 shotgun shells if you mess up
Once startled, witch is sometimes immune to frontal attacks

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Pistol Shots to Kill Following

Shooting at Head/Front torso/Back torso/Calf/Arm

Easy Common Infected 1/1/1/1/1
Normal Common Infected 1//2/2/2/2
Advanced Common Infected 1//2/2/2/2
Expert Common Infected 1/3/3/3/3
Expert Boomer 1/2/2/3/2
Expert Spitter 1/3/3/immune*/3 (*lower legs do not register hits)
Expert Smoker 2/6/6/10/8
Expert Hunter 2/6/6-7/10/8
Expert Jockey 10/11*/10/10/10 (*to shoot torso, had to put him on a rooftop)
Expert Charger 5/18/17/18/17* (*most hits to smaller arm do not register)