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I know this is a very old thread, but I would like to add something.
If you drop two BBs from the same height at the same time, but give BB #2 forward momentum, they will both hit the ground at the same time. The BB is going in 2 directions, FORWARD and DOWN. If the BB is shot perfectly strait, then gravity is the only thing forcing it down. So if they'll hit the ground at the same time, then the faster the BB is going, the farther it will get before hitting the ground.
The hopup is the next factor. Markedman did a very good job of explaining the physics involved in this.
The question now is, which is a bigger factor. I believe the velocety is although I don't have proof to back that up. But I think it is quite obvious. The velocety is also needed in order for the backspin to even exist. The higher the FPS the more the BB will spin, although a heavier BB would be needed so that it wont spin too much.
Real-Steal guns don't have hop-up (of course) but if you found 2 rounds that are the same wieght and aero-dynamics, but one fires at a higher velocety, which do you think would go further? (I guess .308 and 30-06 would be a good example?)
Mark
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