Jg3_Hartmann, it's called 'prop-wash', and i think it is actually incorporated into ZloyPetrushkO's atmosphere mod. See Harnage's post above... :wink:
Check it out.
.50's are fine. So far I've gotten my best kills with them. 1/4 second snapshots at convergence wreak havoc. A full second burst turns anything into a chunk of twisted metal. Learn to shoot with them and you'll see what I mean.