As long as you always chronograph with 0.2g BBs (for the purposes of shooting people) you've nothing to worry about. Some airsofters will disagree (at least that's been my experience), but if you're not shooting people you can up the FPS and energy to whatever you like*.
Airsoft guns are only airsoft guns because they are safe to shoot people - IMO.
*try to avoid pushing the gun into a different firearm category though (for legal reasons ).