.2g BB @ 350 fps
Muzzle Energy: 1.14J
Energy at 25m range: 0.99J @ 326 fps
.43g BB @ 350 fps
Muzzle Energy: ~ 2.5J
Energy at 25m range: 2.13J @ 326 fps
Even at 25m (about 75 feet), a hit from a .4g BB from a 350 fps gun is almost double what the muzzle energy would be to be shot at point blank range with a .2BB @ 350 fps. That can cause some pretty serious injury.