Re: Las Vegas Mass Shooting
Reply #145 –
That explains it 
100 round magazines are pretty common in the USA, not that I saw any on the weapons photographed in the shooter's room. There did seem to be several rifles with bipods and I suspect that he was changing rifles rather than changing magazines - that may knock a second or two off resuming fire when a magazine empties.
I read that they found a paper on which the shooter had calculated the trajectory from his position to the ground. He seems to have been determined to cause as much harm as possible. As I alluded to previously, it could have been much worse if he had used a more systematic fire plan.