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also, this doesnt factor in the fact that the gas expelled by the gun to push the bb out is more than is needed. in other words, when a lighter bb is expelled, a smaller amount of gas is pressurized behind it in the barrel because it moves faster than a heavier bb would. the excess gas just poofs out after the bb leaves the barrel, thus a heavier bb would use more of that poof to power it out which explains why chronied shots of the gun, using different bb weights, resulted in shots with similar velocities. heavier bb's, because they use more of the energy supplied by the gas, carry more energy (the chart becomes non-linear) and thus travel further.
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