http://www.unrealwarfarex.com/redorchestra/
This is an upcoming mod and to be perfectly honest it looks astoundingly good. It's a WWII Mod for UT2004 and also UT2003 set on the eastern front (Germans vs. Russians). It's ultra realistic and runs on less than cutting edge machines well.
Bullets drop as they fly and lose power the further they go. Crosshairs are off so it's Iron sights for aiming or firing from the hip. Player models are top notch and bullet damage to them is superb.
All in all it's the mod I have been waiting for for years.