Tim-
I have been searching for historic examples of throwing stones, and these are the first sharp ones I have seen listed as such. Can you please give me the reference? (Just saw that you listed the reference above. Is that the one?)
I am working on testing the aerodynamics of cement replicas weighted with lead to match the originals. So far, they throw very nicely. I can stick the Acheulean version into the ground like playing mumblety-peg with a knife.