Jim Hamm remarked that the Kiowa natives must have been weight lifters ,because of the heavy pull bows that many of them made, and shot. On the flip side David Carridine interviewed a modern day Souix native that was shooting a replica bow at a moderate distance, and the arrows were barely sticking in the target, but at point blank range on horse back would kill a Buffalo. It was a simple D shaped bow. Their was a diversity of bows made by different tribes, and even with in the tribes. West coast sinew lined bows being among some of the best. I made an eastern woodland replica Sudbury bow from Hickory that turned out much like the museum bow even with the same amount of set. At 45lbs. and my short 25 inch 3 under draw the bow would shoot in the low 130's in fps with a 470 gr. wood arrow ,and flint head. Their was bountiful game back then, and they were good stalkers.