As far as I know, Cahokia-style points were used to kill buffalo just before the introduction of iron. They ranged in size from 1/2" to 1-1/2" long. Other side-notched variations were used as well: Huffaker, Harrell, Reed and Washita. Scallorn types also. All have been found with buffalo remains at "jump" sites. Many different materials were utilized: obsidian, chert, agate, bone, etc. In central Texas, Perdiz points were popular for hunting (as already mentioned).