[Myrddin]

The .308 jacketed bullets recovered is sufficient to distinguish M1 vs .38SPL. The distance claimed also argue for .30-06. The failure to do the ballistic matches between the NG M1 rifles and recovered bullets leaves in question exactly who fired. Were the rifles assigned to specific persons or passed out on a first come, first serve from the armory? We'll never know...and the answer wouldn't change anything.

[Shooter 2.5]

But there were autopsies done on the victims which I wasn’t sure of at the time.

http://www.library.kent.edu/page/14820

The autopsies would have proved all the dead and wounded were shot by the Guardsman but not which soldier hit which student.