Mitch... back in the sixties I participated in some state organized rabbit hunts that drew guys from all around Missouri.
There was a bunch from the Bootheel area that used crescent shaped stone heads which were probably small scrapers, but none the less were the perfect size and weight for arrowheads.
Those boys could really sling a mean arrow and accounted for many rabbits on those hunts. The heads were crescent shaped with a short "tang" and nocked the beejeebers out of a cottontail.
Apparently there were no shortage of the heads in the southeast portion of the state as they all had bucketsful of them.