Obviously this is why ever bullet should be stamped with a unique serial number, with a national database of every bullet sold. All pre-serialized rounds would be illegal after a set grace period, and hand-loading/reloading would be heavily restricted. All sales of lead which might be used to cast bullets would be heavily regulated.
And government controlled cameras should be installed in every home, business, garage, shed, smokehouse and outhouse in the country, plus cameras in every public place, including randomly placed cameras in the middle of the woods.
Oh, and we should ban all guns for good measure.
That ought to solve the problem.
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-twency
(Seriously, stories about hunters shooting other hunters, livestock, etc. out of negligence [or malice] REALLY tick me off. Not sure that there's any good solution though.)