Hunting with a 50 BMG is just asking public relations problems that nether the hunting nor the 50 BMG groups need.
Yes dead is dead wither from a 22 hornet or 50 BMG. But think about this for a minute, shooting a 50 bmg on a range set up for such weapons and operated correctly is about as safe as it gets. Yet accident and equipment failures do happen.
What will happen when your local Walter Mitty takes his new $2500 50 BMG setup to hunt whitetail deer and a common hunting "accident" happens? 20/20, Dateline, CNN, ect will be painting the picture for your law makers.
"Mr Mitty local deer kiler used a 750 grn 50 BMG Military sniper rifle with a range of over 2 miles to kill Mrs Johnson mother of 4 would was hanging wash out to dry in her camp ground...... Mr Mitty claims not to have seen Mrs Johnson though she was only 200 yards away ....."