hmm, well you could do it with a modified hammer throwing style and a heavy duty sling.
If you wanted to do it one handed it would have to be underam and using a very short sling, or you'd just blow your elbow.
we're only talking about just over 5kg here. So not massively heavy.
Use a thick wrist strap for retention cord and short thick sling and it's doable.
ON no accout attempt with afinger loop - that could be nasty.
I'm not advocating everyone try - lol - you could end up with a dislocated shoulder.
But it's certainly not beyond the realms of possibility for someone with decent shoulder and arm strength.
Also should be pretty easy with a heavy duty staff sling.
I think I'm correct in saying that lobohunter has slung sledge hammer heads of similiar weight (but then he's 6'6 and a blacksmith
Isn't he currently hiking across another set of mountains somewhere ?
(any recent sasquatch sightings in the states ?)