Well i dont have COD yet but it is probably because of the convergence. The bullets should cross the gunsight at the distance of convergence.
As bullets fall because of gravity, the longest the convergence, the higher angle tehy come out the barrel.
So if your convergence is 500 and you shoot to a target at 250, with thw target exactly centered in your gunsight your bullets will probably go above target and you miss the shot
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