I linked the two most used graphs from the ATP site. Ranges for airsoft rifles that chrono 400 and 500 FPS with 0.20g BBs; the field legal limits for anything semi/fully automatic and bolt-action sniper rifles, respectively.
Before people jump on these figures about how their gun is upgraded and can shoot 300+ feet and took the TL;DR approach to the study synopsis, here's the important bits:
The gun the BB is fired from is irrelevant. Once the BB leaves the barrel, it has no memory of the gun it was fired from. It has a magnitude (several, technically) and a vector, and in terms of physics, that's all that matters. Consequently, I needed to model the data knowing the initial velocity of the BB, the direction of the BB, and the spin that the BB incurs from hop-up. Granted, different guns will have a slightly different directional component when the BB exits the barrel (and we're talking VERY SLIGHT), and hop-up varies from unit to unit, however the program assumes that the BB is following the path dictated by the direction of the barrel, that the muzzle velocity is, at worst, +/- 2% of it's average muzzle velocity, and that the hop-up is capable of putting a consistent amount of backspin on the BB (i.e., it has been "broken in").
Additionally, I realize that airsoft is an inexact science. Air pockets, surface bumps, diameter inconsistencies, shifting winds, muzzle velocities inconsistencies... these things and others lead to erratic behavior in a BB's trajectory down range. Even so, I think that it is better to have a rough idea of what the "ideal BB" would do in flight, and allow the shooter to factor in their own "fudge factor."
1.49J is approximately 400 FPS with 0.20g BBs, the field limit for nearly all airsoft guns in Minnesota/Wisconsin not covered under the special DMR/Sniper Class restrictions
2.32J is approximately 500 FPS with 0.20g BBs, the field limit for nearly all airsoft bolt-action sniper rifle systems covered by the Sniper class restrictions of >100 ft engagement distance.
It is incredibly important to note that the distance traveled on these graphs ends where there is a drop in BB height of 60 inches. This drop is approximately the height of your average male's shouldered rifle height aiming and firing directly at another target at the same level. A BB can travel farther than the notes distance by aiming above the target/hold-over and "lobbing" the BBs.