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Originally Posted by manchovie
i'm not saying a different amount of gas is expelled depending on the bb weight, i'm saying a different amount of energy is transferred to differently weighted bb's because of the speed at which they exit the gun. if a heavier bb moves slower out of the barrel, the gas behind it is under high pressure until it leaves the barrel. a lighter bb moves faster out of the barrel thus the gas behind it would be less pressurized.
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manchovie what you are saying is right. if BB is lighter it will be pushed with greater force, therefore greater m/s, higher enegy(but I don't know where you are going with this).
Here only the initial speed determined is used by the second formula(Xmax). Weight of the BB is considered to find that initial speed to clear barrel with.
In the table those are virtual calcs from barrel tip to whereever the BB will start falling to the ground.
Danny