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Actually its field proven fact that long flat patch rubbers (like the rhop and orga flat hop for ptw) give you a flatter trajectory.
Your guess is as good as mine as to why, I dont even have a decent guess. As far as I know spin is spin, more spin makes bbs fly up and less spin makes them hit the ground faster, but somehow the rhop and orga flat get you the same range with much less hump in the flight.
Ive also noticed, messing around with different diameter rollers on the ptw, that smaller diameter rollers produce more hump than larger diameter rollers when targetting the same distance.
Again, no idea why, it just works that way. So theorize away, but dont try to theory away a fact =)
Weight of bb is inconsequential to the trajectory of the bb, you can get any bb to fly straight, but heavier ammo will travel further, and you inevitably need more muzzle energy to use heavier ammo. So indirectly, fps does affect range, but only if you use heavier ammo to match.
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