i was having a look at these to see rpg-7 accuracy :
http://en.wikipedia.org/wiki/RPG-7#Hit_probabilities
most of my engagement ranges on basrah are between 200m-300m, this being most likely because armor dose not enter the city often (normally)
up to 300m i would say my success rate is about 90% , with no left right deviation and only drop it is very easy.
according to the above link i should be getting around 22%-51% (and this is US army soldiers shooting it, not insurgents)
also this:
http://www.fas.org/man/dod-101/sys/land/row/rpg-7.pdf
page 11
the round is very susceptible to wind it seems
and i quote:
in a 7mph wind the gunner cannot expect to get 1st round hits more than 50% of the time beyond 180 meters
also in the above link on page 18:
shows first round hit on a tank fully exposed at range 200m-300m you are looking at 50-30% , in cover, as low as 10%
its late so i might have miss read some of that, but all that ^^^^^^^^^^ plus the inaccuracy of a insurgent, which could be experience, to very little experience to me shows there should be more deviation.