Ranges with Heavy Silicone Darts (~1.6g total weight I believe) average 25-30m.
Ranges with Lite Silicone Darts (~1.2g total weight) average 24-28m.
Ranges with Streamlines are anywhere between 20m and 30m because they go completely nuts after about 10m.
Springs are: Stock LS spring, OMW 5+kg spring (total load ~8kg)
EDIT: Don't give these ranges too much weight, I doubt they were properly flat shots.