Slugs

9mm Luger
Used by: Glock 18, Baretta 96G Elite, MP5 Navy, Steyr TMP
Damage: Very Low
Penetration: Very Low
Stopping Power: Low

.357 Sig
Used by: Sig P228
Damage: Low
Penetration: Low
Stopping Power: Low

.45 Automatic Colt Pistols
Used by: the HK USP, Ingram MAC-10, HK UMP 45
Damage: Medium
Penetration: Low
Stopping Power: Medium

.50 Action Express
Used by: IMI Desert Eagle
Damage: High
Penetration: High
Stopping Power: High

12 Gauge Buckshots
Used by: Benelli M3 Super 90, Benelli XM1014
Damage: Varies by distance
Penetration: None
Stopping Power: High

Needlepoints

5.7mm
Used by: FN P90, FN Five-seveN
Damage: Low
Penetration: Medium
Stopping Power:  Very Low

5.56mm NATO
Used by: Sig 552, Colt M4A1, Steyr AUG, Sig 550, FN M249
Damage: Medium
Penetration: High
Stopping Power: Medium

7.62mm
Used by: AK-47, Steyr Scout, HK G3SG/1
Damage: High
Penetration: High
Stopping Power: High

.338 Laupa Magnum
Used by: AI AWM/P
Damage: Very High
Penetration: Very High
Stopping Power: Very High