15 round clip. USP - A in between caliber, slightly more powerful than the 9mm. 13 round clip. 23 - Minimum caliber pistol needed to stop enemy in medium armor. Personal favorite with distinct sound affect and 12 round clip.
Power is very comparable to the desert eagles.
Desert Eagle - 2nd most powerful pistol in the game. Good choice if opponents are wearing heavy armor. 9 round clip. It's the big daddy of pistols. Near assault rifle power.