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Because it's about the energy shat out the front of the gun. A 400fps gun shooting 0.20g would have X joules, the same gun shooting 0.36g BBs at 300fps (the drop, 100fps) would have the same joules but would keep it's energy for a longer distance.
Between 0.20g and 0.25g, there is really only a 30fps drop roughly, but the effective distance will increase by a few dozen feet due to less effect by air currents. 0.28g will give you an additional boost to effective range over 0.25g, etc. Just can't go too heavy.
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