I wish I could synthesize quotes http://forums.steampowered.com/forums/showthread.php?t=2611878 Assuming you never obtain more ammo, SMG can push out 800 damage (not considering crits, damage modifiers, or falloff/ramp-up). Pistol can dish out 720 damage without ever getting ammo considering the same factors as previously stated (scout pistol only, definitely not engineer).