ammunition for the rifle with which the shooter killed 21st graders and six adults at sandy hook elementary. we also learned more today and different details than told previously about how the shooter at sandy hook was am unable to do so much damage, kill so many kids, shoot so many rounds into so many people so quickly that it was over before police could arrive even though police responded within minutes. we had previously been told the killer shot 152 bullets in less than five minutes. we're still told it was less than five minutes but now we're told it was 154 bullets. quoting from the prosecutor today, the shooter shot his way into the building and killed 20 children and six adults with a bushmaster 223 caliber model xm 15. 154 spent 2.23 casings recovered from the scene. it's currently estimated from the time the shooter shot his way into the school until he took his own life was less than five minutes. recovered from the person of the