Howdy,
I dug out a copy of the Mannix book I mentioned, in it he mentioned two types of Bolas.
Argentine- He shows a version much like the one Golok pictured. The first use he mentioned was the catching/breaking of wild horses, and escaped livestock. The main advantage being a greater range then a lasso, about 40 yards maximum effective range.
He mentioned that the bindings could slice the animal pretty badly, or strangle an animal wth a bad hit. The leg hold/trip was most desired.
Hunting- The main game animal was Rhea, which, apparrently, is a big time danger to their dogs. The main hope was for a leg catch on the big birds, then you waded in, and did what you needed to do.
The 2nd best was a hard hit by one of the balls, which would either kill it, or maim it.
Curiously, he mentions the extraction of Pepsin from the bird's gut for medicinal use.
Offensive use: It was basically used as flail, or slug-shot.
Eskimo Bola: This was a neat version, that he saw at Penn. University Museum. It was a bola made with eight balls used for waterfowling. His personal version was made from 1 inch bearings. It served well for goose sized game, and under. He felt that this was the best version for hunting use.
In all cases multiple bolas were carried.