Remember the gyroscopic effect of hop-up on a BB. The heavier it is, the more energy it has, hence the less affected by gravity. It will "appear" to the naked eye to fall to the ground slower, all the while travelling straighter.
Now this assumes you are using a decent quality gun with a decent hop-up, which most players are.
And if a BB loses it's energy slower, it's likely travelling farther and impacting the target with more energy.
That's the answer to the question posed by the thread originator.
Age verifier Northern Alberta
Democracy is two wolves and a sheep discussing what's for dinner.
Freedom is the wolves limping away while the sheep reloads.
Never confuse freedom with democracy.