 I went down the same rabbit hole, and there is nothing that really tells you exactly what caliber it is. I thought they would have let it out by now because we did have a deceased person there and two others. Could you tell by the New York Times photo where it's the trail of the bullet after Buzz Lightyear's head? Does that give any? No, not really. I don't think so. But just like he was pointing out, the small wound that I saw, it reminded me of a .22 rifle.