More animals (men and food types) have been taken with eyeballed arrows straightened with a bone with a hole in it than all alum and carbon arrows put together.
Yeah, and they were also using self made bows, strings made from animal sinue, heads made from flint, and feathers made from real turkeys. They were flinging 800+ grain arrows at a blistering 100 fps from 5 feet off of a horses back.[&:]
They were also drawing on rock walls and living out of animal skin tents.
I didn't believe it would make a difference either until I tried some .006" arrows but it made a big difference.