Just seems pointless for purpose ?
Perhaps for Parks Board selective culling work, perhaps removing a hurt - sick animal from herd safely and with minimum disturbance to herd.
I have to agree: for general use it is pointless.
But somewhere along the line someone built a V8 into a Mini Cooper, just because ... and someone else put a supercharger into a Nissan Patrol to beat the Bugatti Veyron...
Hence I must deduce that someone will hunt an elephant with a BMG.