Great post so far!!

This is a great tip that I started about 10 yrs ago. I cut clumps of hair out of a deer I shot. I took clumps from all over the body, neck, brisket , belly, legs, spine, shoulders etc and put them in labeled ziplock bags. Since then I have made it a point to collect hair from every kill I have made, looking for both entry and exit hair when possible. I have also saved these and labeled them according to where the hit actually was, noting angle and deer position.

This "library" of hair can be a great aid when a marginal shot occurs.