After watching the video about bb weights and distance (where he throws the stone) I believe he is correct (It is a very unscientific way of showing it but in principle he is correct). A lot of people in the sniper realm seem to think that the heavier the bb the better but that is not always correct. If you go too heavy then your gun just won't have the velocity to push it out very far and to get the distance the bb will have to be lobbed to the target (As shown when he fires the 0.42gm bb's). (In my time of experimenting with bb weights I have found the same thing) So this is where high FPS springs come in useful as you will be able to push heavier bb's.I *THINK* he made one (once upon a time) stating that
"Of course lighter BBs travel further" and he symbolized this by throwing a small stone, and a really heavy stone and of course the small stone went further... Perhaps it was the other way around with the heavy stone going further? Either way, I couldn't help but sit there thinking "this is wrong"
How far would a 10gm bb fire from an 450fps airsoft gun? Not very far at all. You would need to up the FPS an incredible amount (Too big for our springs)