Well the first example that comes to mind would be if you wound a buffalo or elephant and your PH gets killed following it up. In that case I think your gun and ammo could be confiscated and checked. Might get you in a World of trouble and not sure of Zimbabwe laws but I suspect in the US you could be charged with a minimum of involuntary manslaughter.So how do the govt/customs or whoever check your bullets energy? Are you required to provide load data or shoot at a gun range?
If not and at the risk of sounding facetious then does it really matter?