He says this:
[In fact, the Bushmaster .223 Connecticut police finally claimed was used in the shooting is designed for long range field use and utilizes high velocity bullets averaging 3,000 feet-per-second, the energy of which even at considerable distance would penetrate several bodies before finally coming to rest in tissue.]
and then this:
According to Dr. Carver and State Police, Lanza shot each victim between 3 and 11 times during a 5 to 7 minute span. If one is to average this out to 7 bullets per individual—excluding misses—Lanza shot 182 times, or once every two seconds. Yet according to the official story Lanza was the sole assassin and armed with only one weapon. Thus if misses and changing the gun’s 30-shot magazine at least 6 times are added to the equation Lanza must have been averaging about one shot per second—extremely skilled use of a single firearm for a young man with absolutely no military training and who was on the verge of being institutionalized. Still, an accurate rendering of the event is even more difficult to arrive at because the chief medical examiner admittedly has no idea exactly how the children were shot or whether a struggle ensued.