Crazy thing I found in the pacific fighters manual

[yellonet]

If they're talking about firing at another aircraft (seems likely as PF is a flight sim) 500m away, moving away from you, the bullets will have a much longer flight time than if fired against a stationary target, you could also say that the bullets travel a lot longer than 500m (relative to the ground), how much obviously depending on how fast you're going, if that's so then the bullets could in fact bounce off human skin.