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Here's my theory...
Picture the path your bullet will take from muzzle to target. For simplicity, assume it is perfectly straight, rather than curved. This will introduce some error, but not much. Now imagine that you can look down this "tube" during a rainstorm and see how often a raindrop passes through it at some point along its length. For the purposes of discussion, let's just say you see one drop every three seconds.
Now calculate how long it will take for your bullet to travel to the target. Again, just for discussion, let's say it's 100 milliseconds. Your bullet, then, has a three second clear window to travel through in 100 milliseconds. If you fire continuously, about 1 bullet in 30 (3 seconds divided by 100 milliseconds) will contact a raindrop (either by hitting one head-on, or having one fall on it).
It remains to be seen if this occasional contact can cause a 10 to turn into a 9, but...
Tim
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