Assuming you could get within range toting the silly useless thing, I doubt if it would be as effective as traditional elephant rifles in .45 and .50 caliber shooting 500 or 535 grain bullets at around 2200 fps. The pointed BMG bullets would tend to change direction when they struck bone. You don't kill an elephant by "hydrostatic shock," whatever that is, and ordinary .458 elephant rounds penetrate plenty deep enough to kill. As do .375s for that matter.
And incidentally, a fast second shot might be nice and you ain'ta gonna do that with no .50 BMG, especially if you have to swing the gun and snap shoot.
